KR101537620B1 - An Electric power supply network system and a control method thereof - Google Patents

Abstract

The present invention relates to a power supply network system and a control method thereof, and more particularly, to a power supply network system and a control method thereof, in which power supplied to a power supply network system supplying electric power to an electric appliance including household appliances, And the amount of consumed electric power of the electrical product can be controlled according to the result.

In order to achieve the above object, the present invention provides a control method of a power supply network system for connecting a plurality of electrical products and supplying power to the plurality of electrical products, the method comprising: Determining whether an energy management mode is selected; The amount of power consumption of the electric appliance being driven according to the set operation order of the electric appliance connected to the electric power supply network system and the set operation order when the energy management mode is selected, And controlling the power supply network system.

Smart meter, energy management device, power supply network system,

Description

An electric power supply network system and a control method thereof,

The present invention relates to a power supply network system and a control method thereof. More particularly, the present invention relates to a power supply network system and a control method thereof, in which power supplied to a power supply network system for supplying electric power to an electric appliance is compared with consumed electric power, And to control the amount of power consumed by the electrical product according to the result.

Electric power for operating electrical appliances such as household appliances used at home or office equipment used in offices is generally supplied through a power plant operated by KEPCO, a transmission line, and a wiring line in this order Feature.

It is a central power source rather than a distributed power source. It has a radial structure spreading from the center to the periphery, and is characterized by a one-way supplier center rather than a consumer center.

In addition, the technology base is analog or electro-mechanical, has to be manually restored in case of an accident, and the equipment must also be manually restored.

The price information of electricity can not be known in real time, but it can be seen only through the power exchange, and because the price system is also a fixed price system, incentives such as incentives for consumers through price changes can not be used There was also a problem.

In order to solve these problems and improve energy efficiency, researches on smart grids (smart grids) are actively underway.

Smart grid refers to the next generation power system and its management system implemented through the fusion and combination of modernized power technology and information and communication technology.

As mentioned above, while the current grid is a centralized, producer-controlled vertical, centralized network, the Smart Grid is less focused on suppliers and has horizontal, collaborative It is a distributed, distributed network.

In the smart grid, the Smart Grid is sometimes referred to as the "energy Internet," because all electrical equipment, power storage, and distributed power are networked to enable interaction between the consumer and the supplier.

In order for such a smart grid to be implemented in the position of a power user such as a home or a building, a network in which individual household appliances and a plurality of household appliances are connected must be bidirectionally communicated with respect to the power source and the power information And the need for new devices for such two-way communication.

In addition, it is possible to provide a power supply network system for home use or business, which can determine the electric charge in real time when using the electric product, recognize the peak time of the electric charge, and save the electric charge as much as possible, And a need for a method of operation thereof.

The present invention is designed to meet such a need, and it is possible to minimize power consumption and electric charges consumed by comparing and recognizing real-time consumed power or expected required electric power and supplied electric power of an electric appliance using electric power supplied in a home or business And a method of controlling the same.

According to an aspect of the present invention,

A control method of a power supply network system in which a plurality of electric products are connected and power is supplied to the plurality of electric products,

Determining whether an energy management mode for saving electricity bill and power consumption in the power supply network system is selected;

The amount of power consumption of the electric appliance being driven according to the set operation order of the electric appliance connected to the electric power supply network system and the set operation order when the energy management mode is selected, And controlling the power supply network system.

When the energy management mode is selected,

Determining whether the user has set an expected required power amount or an electric charge;

Determining whether the priority of operation between the connected electrical appliances is set when the estimated required power amount or the electrical charge is set;

And controlling operations of the plurality of electric appliances in consideration of power supplied to the power supply network system and expected power consumption in real time when priority is set.

The estimated power consumption is calculated based on the frequency of use of the electrical product accumulated in the control unit of the power supply network or the season and the average power consumed during use.

The step of controlling the operation of the appliance in the case where the operation priority among the connected appliance is set,

Determining the number of connected electrical appliances;

Sending and receiving priority of operation and power information in each electrical product;

Comparing the power supplied to the power supply network system with the expected power consumption to determine whether to resume the power when the supplied power is large and storing the surplus power or reselling the surplus power to the power company .

After the surplus power is accumulated or resold to the utility company, it is determined whether there is a change in the priority of operation of the electric product continuously, and the expected electric power is adjusted according to the result, and the adjusted value and the electric power are continuously And a plurality of electrical products are controlled by comparison.

As a result of comparison between the power supplied to the power supply network system and the expected power consumption, if the expected power consumption is large and the power is insufficient,

Determining an operation priority among the electrical appliances;

Further comprising the step of stopping operation of the electrical product in the last of the active electrical products.

If it is judged that the electric power is insufficient as a result of re-comparing the amount of electric power to be supplied and the amount of electric power to be estimated after the last-ranked electric appliance is stopped,

And stopping the operation of the electrical product in the last of the electrical appliances in operation.

After the end of the last-rated electric product operation, a comparison of the amount of electric power supplied and the amount of electric power required for the electric power re-evaluation results in a surplus electric power,

If the surplus power amount is larger than the estimated required power amount of the highest priority electric appliance among the surplus electric power quantity and the electric appliance whose operation stop command is issued,

And to operate the best electric product among the electric appliances for which the operation stop command is issued.

It is determined that the operation priority order among the electric appliances is not set,

And compares the supplied electric energy with the expected electric energy required to supply electric power to the electric appliance.

It is determined that the operation priority order among the electric appliances is not set,

Comparing the supplied amount of power with the expected amount of power required to accumulate surplus power or resale surplus power to the power company according to whether the power reselling function is selected when it is determined that surplus power has been generated due to the remaining amount of supplied power.

If it is determined that the energy management mode is selected but the user does not set the required power amount or the electric charge as a result of the determination,

Operating in a default setting mode for each electrical product;

Determining whether the current time is a power consumption peak time, and informing the user of the power consumption peak time through an alarm if the current time is determined to be a power consumption peak time.

The present invention relates to a power supply system,

A power smart meter for bidirectional communication with the power source and measuring power in real time;

And an energy management device connected to the power smart meter and comparing power information of a plurality of electric products with power information supplied from the outside to control operation of the plurality of electric products,

The energy management device compares an expected required power amount set by a user with a supplied power amount, and when the supplied power amount is small, activates the electric product according to a set operation priority order of the plurality of electric products, or notifies a shortage of the supplied power amount To a power supply network system.

The energy management apparatus includes an input unit through which a user inputs setting information;

A display unit for displaying a real time power consumption amount and an expected power consumption amount according to usage information of the accumulated electric appliance;

A communication unit for communicating with the electric power smart meter and a plurality of electric appliances;

A display unit, a communication unit, and a controller for controlling operation of the electric appliance and supply of electric power.

The energy management device is configured as a wireless communication terminal.

The energy management apparatus is characterized in that the plurality of electrical appliances are provided in an electrical product that must be continuously supplied with power.

And a storage battery connected to the smart meter and the energy management device to store the surplus power according to an instruction of the energy management device when the surplus power is generated.

According to the present invention, it is possible to minimize power consumption and electric charges consumed by comparing real-time consumed electric power or expected required electric power and supplied electric power of an electric appliance using electric power supplied in a home, and comparing the recognition result.

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

FIG. 1 is a schematic diagram of a smart grid. The smart grid includes a power plant generating electricity through thermal power generation, nuclear power generation, or hydroelectric power generation, and a photovoltaic power generation plant and a wind power generation plant using solar power or wind power .

The thermal power plant, nuclear power plant or hydroelectric power plant transmits electric power to the electric power plant through a transmission line, and electric power is sent to the substation in the electric power plant so that electric power is distributed to the consumer such as the home or the office.

Electricity generated by renewable energy is also sent to the substation and distributed to each customer. Electricity transmitted from the substation is distributed to the office or each household through the electric power storage device.

Even in the home using a home network (HAN), it is possible to produce electricity by itself through the fuel cell mounted on sunlight or PHEV (Hybrid Electric Vehicle, Plug in Hybrid Electric Vehicle) The remaining electricity can be returned to the outside.

In addition, a smart meter is provided in an office or a home, so that the user can grasp the electric power and electric charge used in each customer in real time, thereby allowing the user to recognize the current electric energy and electric charge, Can be found.

In addition, since the power plant, power station, storage device, and consumer are two-way communication, it is necessary to notify the storage device, the power station and the power station of the situation of the demanding place separately from the one- Electric distribution can be performed.

Meanwhile, in the above-mentioned smart grid, an energy management system (EMS) for real-time power management of demanders and real-time prediction of required power, and a smart meter (AMI, Advanced Metering infrastructure) It is responsible for the role of

Smart meters under the Smart Grid are based on open architecture and are the foundation technology for integrating consumers. They provide efficient use of electricity for consumers and power suppliers are able to detect system problems and efficiently operate the system do.

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

Thus, the smart meter used in the Smart Grid enables consumer-friendly efficiency concepts 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. The energy management device (EMS) communicates with each electric device and controls it. It is possible to save energy and cost by recognizing the power information of each electric device and performing the power information processing such as the setting of the consumed electric power amount and the electric charge limit based on the information.

Wherein the energy management device (EMS) communicates with a local energy management device (EMS) used in an office or a home and bi-directional communication with the local energy management device (EMS) to process information collected in a local energy management device And a central energy management device (EMS).

Since the smart grid enables real-time communication of power information between the supplier and the consumer, it is possible to realize a "real-time power grid reaction ", thereby reducing the high cost required to meet the peak demand.

FIG. 2 illustrates a power supply network system 10 in a home, which is a major demand source of a smart grid. The power supply network system 10 is a smart grid capable of real- A meter 20 and an energy management device (EMS) 30 connected to the smart meter 20 and connected to and controlling the operation of a plurality of electric devices such as household appliances.

Here, the energy management device (EMS) 30 includes a screen 31 for displaying current electricity consumption state and external environment (temperature, humidity), and is provided with an input button 32 or the like And is provided in the form of a terminal equipped.

The energy management device (EMS) is connected to an electric appliance such as a refrigerator, a washing machine and a dryer, an air conditioner, a TV or a cooking appliance via a network in the home, and performs bidirectional communication with the electric appliance.

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

Further, it is preferable to arrange each electric appliance so as to be connected to other electric appliances so as to be able to communicate with each other.

FIG. 3 illustrates an embodiment of an energy management system (EMS) of the present invention, wherein the energy management system (EMS) is in the form of a terminal with a touch panel 33.

The touch panel 33 displays today's energy information such as the current electricity usage amount and the electricity rate, the estimated rate estimated by the accumulated history, and the carbon dioxide emission amount, the electricity rate of the current time interval, An electricity bill, and a screen 31 on which real-time energy information and weather information including a time zone in which the electricity bill is changed are displayed.

The screen 31 of the touch panel includes a graph showing the amount of power consumed by each household appliance and the change in the power consumption by time slot.

On one side of the screen 31, a button unit 32 is provided to allow the user to set the operation of the electric product or the like as needed.

By using the button unit 32, the user can set the amount of electric power or the limit of the electric charge he / she intends to use. According to the setting, the energy management apparatus (EMS) 30 can control the operation of each electric appliance It will be.

Figure 4 shows a control block diagram of a power supply network under a smart grid and a power supply network system for powering electrical appliances in the home.

Here, the power supply source may be a power company 50 having general power generation equipment (thermal power, nuclear power, hydro power) or generating equipment using renewable energy (solar power, wind power, geothermal power) A home solar power generation facility 51 that can be equipped in each home, and a fuel cell that can be provided in a fuel cell car or a home.

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

The EMS 30 includes a control unit 35 and an input unit 38, a communication unit 34, and a display unit 39.

The communication unit 34 communicates with home appliances such as the refrigerator 101, the washing machine or the dryer 102, the air conditioner 103, the cooking apparatus 104, etc., And transmits and receives information.

In addition, the control unit 35 grasps the setting information input by the user by the input unit 38, the operation history and the electric power usage history information of the electric equipment that have been accumulated in advance, and the amount of electric power supplied from the outside, And controls the operation of the electrical products and controls the power supplied to the electrical products.

In addition, when surplus power is generated, the surplus power is instructed to be resold to the power company or instructed to be stored in the battery (40).

The energy management device (EMS) 130 in FIG. 4 assumes a wireless or wired terminal separately provided from the electrical products.

However, as shown in FIG. 5, an energy management device (EMS) 30 is provided in an electrical product that is to be continuously operated for 24 hours, such as the refrigerator 101, A communication section 34, an input section 38 and a display section 39 of the energy management apparatus (EMS) 30 are provided separately from the energy management apparatus (EMS) 30, It is also conceivable that the operation signal and the power information are transmitted and received and processed.

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

6 to 11 show a control flow of the power supply network system according to the present invention.

As shown in FIG. 6, if the user selectively activates each electrical product as required (S601), the energy management device (EMS) determines whether an energy saving mode for saving electricity or saving electricity is selected (S602 ).

If it is determined that the energy management mode is selected, the energy management apparatus (EMS) determines whether the estimated required power amount or the electric power charge is set by the user (S603).

That is, it is judged whether or not the user made an express intention to consume only a small amount of power or electric power charge per day.

If it is determined that the estimated required power amount or the electric power charge has been set, it is determined whether the operation priority order among a plurality of electric appliances is set (S604).

That is, for example, in the case of a refrigerator, the refrigerator should be kept in a first order because it must be continuously operated for 24 hours to store the refrigerated food in the refrigerator or the refrigerator, and then, if necessary, in order of TV, air conditioner, You can set it.

The reason for this setting is to stop the operation of the electrical product having the last operating order or to minimize the power consumption when the power is consumed in excess of the consumed power amount set by the user as will be described later.

Accordingly, it is determined whether the priority order of operations among the electrical products is set. If the priority is set, the number of electrical products in operation among the electrical products connected to the current power supply network system is determined (S605).

Then, the energy management apparatus (EMS) receives the priority of operation of the electric products and the electric power information used in each electric product, and transmits the received information to the smart meter (S606).

As described above, the operation priority and the power supply amount are continuously determined in the process of transmitting and receiving the power information, and the power amount supplied is compared with the current estimated required power amount as shown in FIG. 7 to determine whether the supplied power amount remains or is insufficient (S701 ).

Here, the estimated required power amount refers to the amount of power that the user sets up through the energy management device (EMS).

The amount of supplied power includes not only the amount of power supplied by the electric power company but also the power supplied from the wind power, solar light, or fuel cell produced by the customer in the customer.

If it is determined that surplus power is generated due to a large amount of supplied power as a result of the comparison between the supplied power amount and the estimated required power amount, it is determined whether a function for selling such surplus power to the utility company is selected (S702) If so, surplus power is sold to the utility (S703).

On the other hand, if the sales function is not set, the surplus electric power may be stored in the battery provided in the customer and used as the supply power in emergency (S704).

After the surplus power sale or power saving process ends, the operation priority of the electrical appliances is continuously determined and the process of determining whether there is a change in the priority order is performed (S705).

On the other hand, as shown in FIG. 8, when the amount of supply power is compared with the expected amount of power required, if there is a deficiency, priority of the electrical product is ascertained (S801), and the operation of the last electrical product Or the power consumption minimization operation is performed (S802).

Then, a step of indicating to the user that the electric appliance to be stopped or minimized power consumption is displayed on the energy management device (EMS) and the user is controlled through the alarm / display device attached to the electric appliance itself (S803 ).

At this time, it is also preferable to install a separate alarm device in the energy management device (EMS) to drive the alarm device.

For example, a first order is a refrigerator, a second order is an air conditioner, a third order is a cooking device, a fourth order is a washing machine, a fifth order is a dryer, and all the electric appliances are in operation If the supply power is insufficient, the operation of the dryer is suspended or the operation of minimizing the amount of heat generated by the heater of the dryer is performed.

After the operation of stopping or minimizing power consumption for the electrical appliances of the last rank, the power supply amount is again compared with the expected required electric energy amount (S804), and surplus electric power is generated, and the surplus electric power is supplied to the electric appliance (Step S805). If the surplus electric power is greater than the expected electric power required for realizing the operation state immediately before the stop operation or the power consumption minimization operation, (S806).

On the other hand, if the energy management mode is selected and the estimated required power amount (electric power charge) is set but the priorities among the electric appliances can not be set, the amount of supplied electric power is compared with the expected required electric power amount as shown in FIG. 9 (S901) (S903). When the surplus power is generated, it is determined whether the power resale function is selected (S903). The surplus power is stored (S905), and surplus power is sold to the power company (S904).

If the surplus power is not generated and the supply power is insufficient, it is preferable to operate in a predetermined power minimum consumption mode for each electric appliance in operation (S902).

That is, in such a case, in the case of a refrigerator, the frequency of the defrosting operation is minimized, the frequency of operation of the compressor is minimized in the case of an air conditioner, and in the case of a clothes dryer, Can be assumed.

If it is determined that the energy management mode is set but the estimated required electric energy amount (electric charge) is not set, it is preferable to control operation in the standard setting mode for each electric appliance as described in FIG. 10 (S1001).

For example, in the case of an air conditioner, when the minimum cooling temperature is 18 degrees and the maximum cooling temperature is set to 30 degrees, the temperature in the standard setting mode is 25 degrees. In the case of a refrigerator, it means that the defrosting operation in the refrigerator is operated so that the defrosting operation frequency is halfway between the minimum frequency and the maximum frequency.

In addition, the middle setting between the interval in which the power consumption is maximized and the interval in which the power consumption is minimized in the washing machine and the cooking device will be considered as the standard setting mode.

Therefore, during the operation of each electric product in the standard setting mode, the smart meter and the energy management device (EMS) judge whether the present time supplies the power consumption peak time (electricity rate progression interval) (S1002), and the power consumption peak time It is notified through an alarm or other visual indication so that the user can know it (S1003).

That is, as shown in FIG. 12, when the amount of consumed electric power reaches the peak between 12:00 and 18:00 and the electricity rate per hour increases, the user can recognize the amount of consumed electric power, thereby saving electric bill .

Accordingly, the user may recognize that the current time is the power consumption peak time, and may suspend some operations of the appliance or save power consumption mode to conserve electricity bill.

6 and 11, if the user does not select the energy management mode, the electric appliance determines whether or not the current operation mode set by the user, regardless of whether the current time reaches the power consumption peak time (S1101).

Figure 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 the power supply network system according to the present invention.

6 to 11 are control flow charts showing a control method of the power supply network system of the present invention.

Figure 12 is a graph of power usage and electricity charges over time of power.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

20: Smart meter 30: Energy management system

34: communication unit 34:

38: input unit 39: display unit

40: Battery

Claims (16)

A control method of a power supply network system in which a plurality of electric products are connected and power is supplied to the plurality of electric products, Determining whether an energy management mode for saving electricity bill and power consumption in the power supply network system is selected; The amount of power consumption of the electric appliance being driven according to the set operation order of the electric appliance connected to the electric power supply network system and the set operation order when the energy management mode is selected, Comprising: The power control step may include: Determining whether the user has set an expected required power amount or an electric charge; Determining whether the priority of operation between the connected electrical appliances is set when the estimated required power amount or the electrical charge is set; Controlling operation of the plurality of electric appliances in consideration of power supplied to the power supply network system and expected power consumption in real time when priority is set. delete The method according to claim 1, Wherein the estimated power consumption is calculated based on a frequency of use of each of the electric appliances accumulated in the control unit of the power supply network or an average value of consumed power during use. The method according to claim 1, The step of controlling the operation of the appliance in the case where the operation priority among the connected appliance is set, Determining the number of connected electrical appliances; Sending and receiving priority of operation and power information in each electrical product; Comparing the power supplied to the power supply network system with the expected power consumption to determine whether to resume the power when the supplied power is large and storing the surplus power or reselling the surplus power to the power company Wherein the power supply network system comprises: 5. The method of claim 4, After the surplus power is accumulated or resold to the utility company, it is determined whether there is a change in the priority of operation of the electric product continuously, and the expected electric power is adjusted according to the result, and the adjusted value and the electric power are continuously And controlling the plurality of electrical products by comparing the plurality of electrical products. 5. The method of claim 4, As a result of comparison between the power supplied to the power supply network system and the expected power consumption, if the expected power consumption is large and the power is insufficient, Determining an operation priority among the electrical appliances; Further comprising the step of stopping the operation of the electrical product in the last of the active electrical appliances. The method according to claim 6, If it is judged that the electric power is insufficient as a result of re-comparing the amount of electric power to be supplied and the amount of electric power to be estimated after the last-ranked electric appliance is stopped, Further comprising the step of: stopping operation of the next-highest electrical product in the active electrical product. 8. The method of claim 7, After the end of the last-rated electric product operation, a comparison of the amount of electric power supplied and the amount of electric power required for the electric power re-evaluation results in a surplus electric power, If the surplus power amount is larger than the estimated required power amount of the highest priority electric appliance among the surplus electric power quantity and the electric appliance whose operation stop command is issued, Operating the best-of-charge electric appliance among the appliances for which the operation stop command is issued. The method according to claim 1, It is determined that the operation priority order among the electric appliances is not set, Comparing the supplied electric energy with an expected electric energy required to supply electric power, and if it is determined that the supplied electric energy is insufficient, controlling to operate in a minimum power consumption mode for each electric appliance. The method according to claim 1, It is determined that the operation priority order among the electric appliances is not set, Comparing the supplied amount of power with an expected amount of power required to accumulate surplus power or resale surplus power to the power company according to whether the power resale function is selected when it is determined that surplus power has been generated due to the remaining amount of supplied power, A method of controlling a supply network system. The method according to claim 1, If it is determined that the energy management mode is selected but the user does not set the required power amount or the electric charge as a result of the determination, Operating in a default setting mode for each electrical product; Determining whether the current time is a power consumption peak time, and notifying the user of the power consumption peak time by an alarm if the current time is determined to be a power consumption peak time. A power supply source; A power smart meter for bidirectional communication with the power source and measuring power in real time; And an energy management device connected to the power smart meter and comparing power information of a plurality of electric products with power information supplied from the outside to control operation of the plurality of electric products, The energy management device includes: An input unit for inputting setting information by a user; A display unit for displaying a real time power consumption amount and an expected power consumption amount according to usage information of the accumulated electric appliance; A communication unit for communicating with the electric power smart meter and a plurality of electric appliances; And a control unit for controlling operations of the input unit, the display unit, the communication unit, and the electric appliance and the supply of electric power, The energy management device compares an expected required power amount set by a user with a supplied power amount, and when the supplied power amount is small, activates the electric product according to a set operation priority order of the plurality of electric products, or notifies a shortage of the supplied power amount Power supply network system. delete 13. The method of claim 12, Wherein the energy management device comprises a wireless communication terminal. 13. The method of claim 12, Wherein the energy management device is provided in an electrical product in which a power supply is continuously supplied among a plurality of electrical products. 13. The method of claim 12, Further comprising a battery connected to the smart meter and the energy management device to store the surplus power according to the command of the energy management device when surplus power is generated.

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