KR20110042863A - A network system supplying electric power and a control method thereof - Google Patents

Abstract

PURPOSE: A power supply network system and a control method thereof are provided to minimize power consumption and electricity bill by selectively storing commercial electricity or using stored electricity according to the price of commercial electricity. CONSTITUTION: A measuring device(20) measures the provided electricity and electricity bill on a house in real time. An energy management device(30) controls the operation of electrical appliances(101-104) based on the power information of the electrical appliances and external power supply information. The energy management device comprises a controller(35), an input unit(38), a communication unit(34), and a display unit(39). A storage battery implements data communication with the energy management device to store electricity according to the command of the energy management device.

Description

A network system supplying electric power and a control method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply network system and a control method thereof, and more particularly, to an invention in which an electric charge can be saved by using power stored in a storage battery.

Electric power for the operation of electrical appliances such as home appliances used in homes or office equipment used in offices is generally supplied through a power plant operated by KEPCO, a transmission line, and a wiring line. It is characteristic.

It has the characteristics of a central power source, not a distributed power source, a radial structure that spreads from the center to the periphery, and is characterized by a unidirectional supplier center rather than a consumer center.

In addition, the technology base is analog or electromechanical, there is a problem that must be restored manually in case of an accident, and the equipment must also be restored manually.

The price information for electricity is not only available in real time, but only limitedly through the power exchange, and since the price system is a de facto fixed price system, incentives such as incentives to consumers through price changes can be used. There was also a problem that can not be.

In order to solve these problems and improve energy efficiency, research on smart grids (intelligent power grids) has been actively conducted recently.

The smart grid refers to the next generation power system and its management system that are realized through the convergence and complex of modern power technology and information communication technology.

As mentioned above, the current grid is a centralized, producer-controlled, vertical, centralized network, whereas the smart grid is less focused on suppliers and horizontal, collaborative to enable interaction between consumers and suppliers. It is an enemy, decentralized network.

The smart grid is sometimes called the "energy internet" because all electrical devices, power storage devices and distributed power supplies are networked to enable interaction between consumers and suppliers.

On the other hand, in order to realize such a smart grid from the perspective of a power consumer such as a home or a building, it is necessary to bidirectionally communicate with a power supply source and power information, instead of unilaterally receiving power from an individual home appliance and a network to which a plurality of home appliances are connected. And the need for new devices for this two-way communication.

In addition, the power supply network system for home or business that can reduce the electricity bill by judging the electricity bill in real time and recognizing the peak time of the electricity bill when possible, and refraining from using the electrical appliance at that time. And the need for its operation was raised.

The present invention has been made to satisfy this need, and an object thereof is to provide an invention that can save an electric charge by using electric power stored in a storage battery.

The present invention for achieving this object, the power measurement device for measuring the power information in real-time and bidirectional communication with the power supply; An energy management device connected to the measuring device and configured to control an operation of the electrical appliance or to issue a power storage command based on power information of at least one electrical appliance and power information supplied from the outside; It is provided so as to be communicable with the energy management device, and provides a power supply network system comprising a storage battery capable of storing electricity in accordance with the control command of the energy management device.

The storage battery is characterized in that it is provided in a state connected to each of the electrical appliances.

When a plurality of the storage battery is provided, each storage battery is connected to each other is characterized in that electricity can be moved from one storage battery to another.

The energy management device is characterized in that when the current time belongs to the highest electric charge period, the power supplied from the power company cut off and controls so that power is supplied from the battery.

The energy management device is characterized in that to control the power supply from the storage battery connected to other electrical appliances when the power supply to the electrical product is insufficient in the storage battery connected to a specific electrical appliance.

The energy management device is characterized in that when the current time belongs to the lowest electricity bill, the electricity of the power company is stored in the storage battery.

The energy management device includes an input unit for inputting setting information by a user;

A display unit for displaying an expected power consumption amount according to real-time power consumption amount and accumulated use information of the electric product;

A communication unit for communicating with the power measuring device and a plurality of electrical appliances;

And an input unit, a display unit, a communication unit, and a control unit for controlling an operation and supply of electric power or giving power storage commands.

The energy management device is characterized by consisting of a wireless communication terminal.

The energy management device is characterized in that it is provided in the electrical appliances that the power supply must be constantly supplied among the plurality of electrical appliances.

On the other hand, the present invention comprises the steps of operating in the energy management mode;

Determining whether the current time falls within a maximum electric charge period at which an electric charge per hour is charged at a maximum;

If the current time is within the electric charge maximum period, the control method of the power supply network system, characterized in that it comprises the step of shutting off the power supply of the external power company and supplying the electricity stored in the predetermined battery to the target electrical appliance. To provide.

Determining whether the current time falls within the lowest electric charge period at which the electric charge per hour is charged at the lowest;

If the current time belongs to the lowest electric charge period, characterized in that it further comprises the step of including the step of storing electricity to the battery.

The battery for supplying electricity to the target electrical appliance is selected as a storage battery connected to the target electrical appliance, and before the power supply by the battery determines the amount of power storage of the battery is a predetermined value or more;

If it is determined that the amount of power storage is more than a predetermined value, characterized in that it further comprises the step of supplying power to the operation target electrical appliance from the battery.

If it is determined that the power storage amount of the storage battery connected to the target electrical product is less than a predetermined value, further comprising the step of supplying power to the target electrical product from the storage battery connected to the non-operating electrical product.

Determining whether a storage capacity of a storage battery connected to an electrical appliance that is not an operation target is insufficient;

If the amount of power storage is insufficient, characterized in that it further comprises the step of resuming the power supply of the power company.

Determining whether a current time deviates from the maximum electric charge period;

If it is determined that the current time is out of the maximum electric charge period, it is characterized in that it further comprises the step of shutting off the power supply from the battery and resume the power supply of the power company.

According to the present invention, it is possible to minimize power consumption and electric charges by recognizing and comparing the real-time power consumption or the expected power required with the power supplied to the home appliance using power supplied in the home.

In other words, if the power bill imposed by the power company is the highest, the power company does not draw power and uses the electricity stored in itself to drive necessary electrical appliances. Because it can store electricity, it is possible to enjoy the effect of saving electricity bills.

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

1 is a schematic diagram of a smart grid, which includes a power plant that generates power through thermal, nuclear, or hydro, a solar power plant using wind or wind power as renewable energy, and a wind power plant. .

In addition, the thermal power plant or nuclear power plant or hydroelectric power station transmits power to a power station through a transmission line, and the power station sends electricity to a substation so that the electricity is distributed to a demand destination such as a home or an office.

The electricity produced by the renewable energy is also sent to substations to be distributed to each customer. The electricity transmitted from the substation is distributed to the office or each household via the power storage device.

Even in homes that use the Home Area Network (HAN), it is possible to supply electricity by producing electricity by itself through fuel cells mounted on solar power or PHEV (Plug-in Hybrid Electric Vehicle). The remaining electricity can also be sold outside.

In addition, the smart measuring device is installed in the office or home to identify the real-time power and electricity bills used at each demand source. Through this, the user recognizes the amount of electricity and the electricity bill currently used, and according to the situation, the power consumption or the electricity bill according to the situation. Measures to reduce the

On the other hand, since the power plant, power station, storage device and the source of demand are bidirectional communication, only the unilaterally receive electricity from the source of demand, and notify the storage, power station, and power plant of the demand source to produce electricity according to the situation of the source of demand. Electric distribution can be performed.

Meanwhile, in the smart grid, an energy management system (EMS), which is responsible for real-time power management and real-time prediction of power consumption, and an advanced metering infrastructure (AMI), which measures power consumption in real time, are pivotal. Play the role of person.

Here, the measuring device under the smart grid is a basic technology for integrating consumers on the basis of open architecture, and provides consumers with the ability to efficiently use electricity, and provides power providers with the ability to operate the system efficiently by detecting problems in the system. do.

Here, the open architecture, unlike a general communication network, refers to a standard that allows all electric devices to be connected to each other regardless of which manufacturer the electric device is manufactured in a smart grid system.

Thus, the instrumentation used in the smart grid enables a consumer friendly efficiency concept such as "Prices to Devices."

That is, the real-time price signal of the electric power market is relayed through the energy management device (EMS) installed in each home, and the energy management device (EMS) communicates with and controls each electric device so that the user can control the energy management device (EMS). By recognizing the power information of each electric device and performing the power information processing such as the amount of power consumption or the electric charge limit setting based on the power information, energy and cost can be saved.

The energy management device (EMS) is a local energy management device (EMS) used in the office or at home, and the local energy management device (EMS) by performing bidirectional communication to process the information collected from the local energy management device (EMS) It is preferably composed of a central energy management device (EMS).

The smart grid enables real-time communication of power information between suppliers and consumers, enabling "real-time grid response" to be realized, thereby reducing the high cost of meeting peak demand.

2 is a diagram illustrating a power supply network system 10 in a home, which is a major demand source of a smart grid, and the power supply network system 10 may measure in real time the power and electricity rates supplied to each home. An energy management device (EMS) 30 connected to a device (smart meter) 20 and the measurement device (smart meter) 20 and connected to a plurality of electrical devices such as a home appliance and controlling their operation Equipped.

Here, the energy management device (EMS) 30 has a screen 31 for displaying the current state of electricity consumption and the external environment (temperature, humidity), and provides an input button 32 or the like which can be operated by a user. It is preferably provided in the form of a terminal provided.

The energy management device (EMS) is connected to electrical appliances such as the refrigerator 101, the washing machine and the dryer 102, the air conditioner 103, the TV 105 or the cooking appliance 104 through the home network. The two sides communicate with each other.

Such communication may be via wireless or wired, such as a PLC.

In addition, it is preferable that the electrical appliances are arranged to be connected to other electrical appliances so that communication is possible.

On the other hand, the electrical appliances are connected to the storage battery (201, 202, 203, 204, 205) that can supply power to each electrical product, if necessary, each storage battery is connected to each other.

Figure 3 shows an embodiment of the energy management device (EMS) of the present invention, the energy management device (EMS) is in the form of a terminal having a touch panel 33.

The touch panel 33 includes current energy information such as current electricity consumption, electricity charges, and estimated charges and carbon dioxide generation amount estimated by accumulated history, electricity charges of the current time interval, and electricity of the next time interval. A screen 31 is displayed in which real-time energy information and weather information including a time period in which the rate and the electricity rate change are displayed.

In addition, the screen 31 of the touch panel includes a graph showing power consumption and time change of each electrical appliance, and includes a graph for easily recognizing the electrical storage stored in the storage battery connected to each electrical appliance. .

This allows the user to easily determine whether or not each power storage amount is sufficient.

On the other hand, one side of the screen 31 is provided with a button unit 32 that allows the user to set the operation, etc. of the electrical appliance as needed.

By using the button unit 32, the user can set a limit of the amount of electricity or electricity bill that he or she wants to use, and according to this setting, the energy management device (EMS) 30 can control the operation of each electric product. Will be.

FIG. 4 shows a control block diagram of a power supply network system that is responsible for power supply for a power supply under a smart grid and electrical appliances in a home.

Here, the power supply source may be a power company 50 having general power generation equipment (fire power, nuclear power, hydropower) or power generation equipment using renewable energy (solar, wind, geothermal) and the like. It includes a self-photovoltaic facility 51 that can be provided in each home, and a fuel cell that can be provided in a fuel cell car or a home.

The power supply source is connected to the measuring device (smart meter) 20, the measuring device (smart meter) 20 is a storage battery 40 capable of storing surplus power and the energy management device (EMS) (30) ).

Here, the configuration of the energy management device (EMS) 30, the control unit 35, the input unit 38, the communication unit 34, the display unit 39 is included.

The communication unit 34 communicates with electrical appliances in a home, that is, a refrigerator 101, a washing machine or a dryer 102, an air conditioner 103, a cooking appliance 104, and the like, and power information and driving thereof. It is responsible for transmitting and receiving information.

In addition, the control unit 35 grasps the setting information input by the user by the input unit 38, the operation and power usage history information of the existing electric products, and the amount of power supplied from the outside in real time, and obtains these information. Processing in real time controls the operation of electrical appliances and controls the power supplied to these electrical appliances.

Each of the electrical appliances is provided with a battery 201; 202; 203; 204, and each battery is connected to another battery.

The storage batteries 201; 202; 203; 204 are able to communicate with the communication unit 34 of the energy management device (EMS) 30.

Electricity is stored in the storage batteries 201; 202; 203; 204 according to a power storage command of the control unit 35 of the energy management apparatus (EMS) 30. In addition, the storage batteries 201; 202; 203; 204 may supply power stored in accordance with a control command of the controller 35 to an electrical product to which each storage battery is connected, or to another electrical product.

However, as shown in FIG. 5, it is also conceivable to provide an energy management device (EMS) 30 in the electrical appliance, such as the refrigerator 101, which should be operated continuously for 24 hours.

A control unit 35, a communication unit 34, an input unit 38, and a display unit 39 of the energy management device (EMS) 30 are provided separately from the control unit 101a and the storage battery 201 of the electrical appliance having such characteristics. It is also conceivable for the energy management device (EMS) 30 to transmit and receive operating signals and power information of all electrical appliances.

Except for the location of the energy management device (EMS) 30 as described above, since the operation is the same as in FIG. 4, detailed description thereof will be omitted.

6 to 8 show the control flow of the power supply network system according to the present invention.

As shown in Fig. 6, when the user selectively operates each electric product as needed (S601) and operates the energy management device (EMS) (S602), the electric charge can be saved and the external power supply can be provided. Energy management mode that can be minimized is activated (S603).

In the state where the energy management mode is operated, the energy management device EMS determines whether the current time interval is the maximum electric charge period at which the hourly electric charge is imposed the maximum (S604).

That is, as shown in Fig. 9, the power consumption amount reaches a maximum between 12 and 18 o'clock, and the hourly electric charge is also maximized in conjunction with it. Therefore, the use of electric power by the utility company in this section means that the electricity bill expenditure will increase significantly.

If it is determined that the current time is not the maximum electric charge section, the power company will continue to receive power (S605).

Then, it is determined whether the current time is the lowest electricity rate section in which the hourly electricity rate is the lowest as the late night time while maintaining the state (S606).

As a result of determination, when it is determined that the current time is the lowest electric charge period, the energy management device (EMS) issues a power storage command so that electricity is stored in each battery (S607).

On the other hand, if it is determined that the current time is the maximum electric charge period, it is necessary to first determine whether the storage capacity of the battery connected to the target electrical appliance is sufficient to continuously operate the target electrical appliance for a predetermined time or more.

That is, as shown in FIG. 7, the power storage amount of the storage battery connected to the current target electrical appliance is determined to be greater than or equal to a predetermined value (S701). S702).

Then, to receive power from the storage battery of the operation target electrical appliance (S703).

On the other hand, it is determined whether the current time is out of the maximum electric charge period while the state continues (S704).

If it is determined that the electricity bill is out of the maximum section, the power supply from the battery is cut off (705), and the power supply from the power company is resumed (S706).

On the other hand, when it is determined that the storage capacity of the storage battery connected to the operation target electrical appliances is less than a predetermined value, as shown in Figure 8, the storage capacity of the storage battery connected to other electrical appliances other than the operation target is operated for a predetermined time or more It is determined whether a predetermined value is allowed (S801).

When it is determined that the storage capacity of the storage battery connected to another electrical product is greater than or equal to a predetermined value, power supply from the power company is cut off (S802), and power is supplied from the storage battery connected to the other electrical product (S803).

Then, it is determined whether the storage capacity of the storage battery connected to other electrical products is insufficient (S804), and if determined to be insufficient, the process of restarting the power supply from the power company (S805).

On the other hand, if it is determined in step S801 that the storage capacity of the storage battery connected to other electrical appliances does not reach a predetermined value, the power company continues to receive power (S806).

In operation S805 or S806, it is determined whether the current time is the lowest electric charge period (S606). If the determination result is the lowest electric charge period, the electric power is stored at a low price in the battery to retain electricity to be used later.

1 is a schematic diagram of a smart grid.

2 is a schematic diagram of a power supply network system according to the present invention.

3 is a front view of the management apparatus according to the present invention.

4 is a control block diagram of a power supply network system according to the present invention.

5 is a control block diagram according to another embodiment of a power supply network system according to the present invention.

6 to 8 are control flowcharts illustrating a control method of the power supply network system of the present invention.

9 is a graph of power consumption and power charge over time of power.

<Description of Main Parts of the Present Invention>

20: measuring device (smart meter) 30: energy management system

34: communication unit 34: control unit

38: input unit 39: display unit

201; 202; 203; 204: Storage battery

Claims (15)

 A power measurement device for performing bidirectional communication with a power supply source and measuring power information in real time; An energy management device connected to the measuring device and configured to control an operation of the electrical appliance or to issue a power storage command based on power information of at least one electrical appliance and power information supplied from the outside; And a storage battery provided to be in communication with the energy management device and capable of storing electricity according to a command of the energy management device. The method of claim 1, The power storage network system, characterized in that the battery is provided in a state connected to each of the electrical appliances. The method of claim 2, When the battery is provided in plural, each battery is connected to each other power supply network system, characterized in that electricity can be moved from one battery to another battery. The method of claim 2, The energy management device, if the current time belongs to the highest electricity bill interval, the power supply network system, characterized in that to cut off the power supplied from the power company and to supply power from the battery. The method of claim 4, wherein The energy management device is a power supply network system, characterized in that for controlling the power supplied from the storage battery connected to other electrical products when the power supply to the electrical product from the storage battery connected to a specific electrical product. The method of claim 2, The energy management device is a power supply network system, characterized in that if the current time belongs to the lowest electricity bill, the power storage command to the power storage so that the electricity of the power company is stored in the battery. The method of claim 1, The energy management device includes an input unit for inputting setting information by a user; A display unit for displaying an expected power consumption amount according to real-time power consumption amount and accumulated use information of the electric product; A communication unit for communicating with the power measuring device and a plurality of electrical appliances; And an input unit, a display unit, a communication unit, and a control unit for controlling an operation and supply of electric power or giving power storage commands. The method of claim 2, The energy management device is a power supply network system, characterized in that consisting of a wireless communication terminal. The method of claim 12, The energy management device is a power supply network system, characterized in that provided in the electrical product that the power supply of the plurality of electrical appliances to be constantly supplied. Operating in an energy management mode; Determining whether the current time falls within a maximum electric charge period at which an electric charge per hour is charged at a maximum; If the current time is within the electric charge maximum period, the control method of the power supply network system, characterized in that it comprises the step of shutting off the power supply of the external power company and supplying the electricity stored in the predetermined battery to the target electrical appliance. . The method of claim 10, Determining whether the current time falls within the lowest electric charge period at which the electric charge per hour is charged at the lowest; If the current time belongs to the lowest electricity bill, the control method of the power supply network system, characterized in that it further comprises the step of storing electricity to the battery. The method of claim 10, The battery for supplying electricity to the target electrical appliance is selected as a storage battery connected to the target electrical appliance, and before the power supply by the battery determines the amount of power storage of the battery is a predetermined value or more; And when the amount of power storage is determined to be greater than or equal to a predetermined value, supplying electric power from the battery to the operation target electrical appliance. The method of claim 12, If it is determined that the storage capacity of the storage battery connected to the target electrical product is less than a predetermined value, the power supply network further comprises the step of supplying power to the target electrical product from the storage battery connected to the non-operating electrical product Control method of the system. The method of claim 13, Determining whether a storage capacity of a storage battery connected to an electrical appliance that is not an operation target is insufficient; The method of controlling the power supply network system, characterized in that it further comprises the step of restarting the power supply of the power company if the amount of power storage is insufficient. The method of claim 10, Determining whether a current time deviates from the maximum electric charge period; If it is determined that the current time is out of the maximum electric charge period, the control method of the power supply network system, characterized in that it further comprises the step of shutting off the power supply from the battery and resume the power supply of the power company.

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