KR20110042862A - An electric power supply network system and a control method thereof - Google Patents

Abstract

PURPOSE: An electric power supply network system and a control method thereof are provided to compare the predicted necessary power amount and the actual power consumption. CONSTITUTION: A power smart meter(20) performs two way communication with a power supply. The electricity smart meter measures the electricity in real time. An energy management device is connected to the electricity smart meter. The energy management device compares the power Information of a plurality of electrical appliances with the external power information. The energy management device controls the operation of the electrical appliances.

Description

An electric power supply network system and a control method

The present invention relates to a power supply network system and a method of controlling the same. Specifically, the power supplied to a power supply network system for supplying power to an electrical product and a power consumption or an estimated power consumption of each electrical product are compared in real time. The present invention relates to an invention capable of controlling the amount of power consumed by electrical appliances.

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 of electricity is not only available in real time, but also limitedly through the power exchange, and since the price system is also a fixed price system, incentives such as incentives to consumers through price changes cannot be used. There was also a problem.

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 at the time of use of the electric product, and refraining from using the electrical appliance at that time as much as possible. And the need for its operation was raised.

The present invention is to meet this need, it is possible to minimize the power consumption and electricity bills by recognizing and comparing the real-time power consumption or expected power supply and the power supply of the electrical appliances using the power supplied in the home or workplace The present invention provides a power supply network system and a control method thereof.

The present invention for achieving this object,

In the control method of the power supply network system for connecting a plurality of electrical appliances and supplying power to the plurality of electrical appliances,

Determining whether an energy management mode is selected for saving electric charges and power consumption in the power network system;

When the energy management mode is selected, the amount of power consumed by the electric appliance being driven is determined according to the amount of power supplied to the power supply network system or the time of power supply, whether to set the operation priority of the electrical appliance connected to the power supply network, and the set operation priority. It provides a control method of a power supply network system to control.

When the energy management mode is selected,

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

Determining whether the priority of the operation between the connected electric appliances is set when the expected amount of electric power or the electric charge is set;

And controlling the operation of the plurality of electrical appliances in consideration of the power supplied to the power supply network system and the expected power consumption when the priority is set.

The estimated power consumption is characterized by the day of the week or seasonal use frequency of the electrical appliances accumulated in the control unit of the power supply network and the average value of the power consumption during use.

In the case where the operation priority between the connected electrical appliances is set, controlling the operation of the electrical appliances includes:

Identifying the number of connected electrical appliances;

Transmitting and receiving priorities of operation and power information in each electric appliance;

When surplus power is generated by comparing the power supplied to the power supply network system with the expected power consumption, and determining whether to resell the power, accumulate surplus power or resell surplus power to the power company. It is characterized by including.

After the step of accumulating surplus power or reselling it to a utility company, it is determined whether there is a change in the operational priority of the electric appliance continuously, and according to the result, the estimated power consumption is adjusted, and the adjusted value and supply power are continuously adjusted. In comparison, a plurality of electrical appliances are controlled.

As a result of comparing the estimated power consumption with the power supplied to the power supply network system, when the estimated power consumption is large and the power is insufficient,

Identifying operational priorities between electrical appliances;

And stopping the operation of the last-ranked electrical appliance among the electrical appliances in operation.

After the shutdown of the last-ranked electrical appliance, if it is determined that the power supply is insufficient as a result of comparing the amount of power supplied to the estimated power required again,

And stopping the operation of the next highest priority electrical appliance among the electrical appliances in operation.

After the shutdown of the last-ranked electrical appliance, surplus power is generated as a result of comparing the amount of power supplied to the estimated power required again.

When surplus power is larger than the expected power consumption of the highest rated electrical appliance of the ordered shutdown,

It is characterized by operating the highest priority electrical appliances of the ordered to stop operation.

It is determined that the priority of operation between electrical appliances is not set,

If it is determined that the amount of power supply is insufficient by comparing the amount of power supplied and the expected amount of power, it is characterized in that the control to operate in the minimum power consumption mode for each electrical product.

It is determined that the priority of operation between electrical appliances is not set,

When it is determined that surplus power is generated due to the remaining amount of supply power, the surplus power is stored or the surplus power is resold to the power company according to whether the power resale function is selected.

If the energy management mode is selected, but it is determined that the user has set an expected required amount of electricity or an electric charge, it is determined that such setting is not made.

Operating in a basic setting mode for each electric product;

If it is determined that the current time is the power consumption peak time, it is characterized in that it comprises the step of informing the user through the alarm if it is determined as the power consumption peak time.

The present invention provides a power supply;

A power smart meter that performs bidirectional communication with the power supply and measures power in real time;

And an energy management device connected to the power smart meter and controlling the operation of the plurality of electrical appliances by comparing the power information of the plurality of electrical appliances with the power information supplied from the outside.

The energy management device compares the estimated required power amount and the power supply amount set by the user to operate the electric products according to the set operating priority of the plurality of electric products or notify the lack of power supply when the supply power amount is small. The present invention relates to a power supply network system.

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 smart meter 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 power of the electrical appliance.

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.

When the surplus power is generated, characterized in that it further comprises a storage battery connected to the smart meter and the energy management device to accumulate it by the command of the energy management device.

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.

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, smart smart meters are installed in offices and homes so that users can grasp the power and electricity rates used by each user in real time. 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 a smart meter (AMI), which measures power consumption in real time, are pivotal. Play the role of person.

Here, smart meters under the smart grid are the foundation technologies for integrating consumers on the basis of open architecture, providing consumers with the efficient use of electricity, and providing power suppliers with the ability to operate systems efficiently by detecting system problems. 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, smart meters used in the smart grid enable 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, wherein the power supply network system 10 is a smart device capable of measuring power and electricity rates supplied to each home in real time. A meter 20 and an energy management device (EMS) 30 is connected to the smart meter 20 and connected to a plurality of electric devices such as home appliances and control their operation.

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 a refrigerator, a washing machine and a dryer, an air conditioner, a TV, or a cooking appliance through a network inside the home, thereby performing two-way communication with them.

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.

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 rate, estimated charge and carbon dioxide generation amount estimated by accumulated history, electricity rate of the current time interval, and next time interval. A screen 31 is displayed in which real-time energy information and weather information including an electricity rate and a time zone in which the electricity rate changes are displayed.

In addition, the screen 31 of the touch panel includes a graph showing power consumption by time zone of each home appliance and a change thereof.

One side of the screen 31 is provided with a button unit 32 that allows the user to set the operation of the electrical appliance, if necessary.

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 smart meter 20, the smart meter 20 is connected to the battery 40 and the energy management device (EMS) 30 that can store the surplus power.

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.

In addition, when surplus power is generated, the surplus power is instructed to be resold to the power company or to the storage battery 40.

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

However, as shown in Figure 5, such as the refrigerator 101 of the electrical appliance, the energy management device (EMS) 30 is provided in the electrical appliance that must be operated continuously for 24 hours, the control unit 101a of such electrical appliances Separately, the control unit 35, the communication unit 34, the input unit 38, and the display unit 39 of the energy management device (EMS) 30 are provided so that the electric energy management device (EMS) 30 may It is also conceivable for the operation signal and power information to be transmitted and received and processed.

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

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

As shown in FIG. 6, when a user selectively operates each electric product as needed (S601), the energy management device EMS determines whether an energy management mode for saving electricity or saving electricity is selected (S602). ).

In this case, when it is determined that the energy management mode is selected, the EMS again determines whether the required amount of power or the electric charge is set by the user (S603).

In other words, it is determined whether the user has made an explicit intention of expressing only how much power or electric charge is consumed per day.

If it is determined that the expected required amount of power or electricity charge is set, it is determined whether the operation priority between the plurality of electrical appliances is set (S604).

That is, for example, a refrigerator is continuously operated for 24 hours, so that the storage must be stored in the refrigerator or refrigerated, and is set in the first order, followed by a TV, an air conditioner, a washing machine, and so on. Will be set.

The reason for setting as described above is to stop the operation of the electric appliance having the last operation order or minimize the power consumption when power is consumed more than the power consumption set by the user.

Therefore, it is determined whether the operation priority between the electrical appliances is set, and if it is set, grasp the number of the electrical appliances in operation among the electrical appliances currently connected to the power supply network system (S605).

In addition, the energy management apparatus (EMS) receives the priority of the operation of the electrical appliances and the power information used in each electrical appliance, and passes the process to the smart meter (S606).

As described above, the power supply is continuously determined in the process of transmitting and receiving the priority information and power information, and as shown in FIG. ).

Here, the expected amount of power means the amount of power previously set by the user through the energy management device (EMS).

In addition, the amount of power supplied includes not only the amount of power supplied by the power company, but also the power supplied from wind, solar, or fuel cells produced by the customer.

As a result of comparing the power supply with the expected power consumption, if it is determined that surplus power has been generated due to a large supply power, it is determined whether a function for selling such surplus power to the power company is selected (S702), and as a result, the sales function If set, the surplus power is sold to the electric power company (S703).

On the other hand, if the sales function is not set, such surplus power will be stored in the storage battery provided in the demand source, and may be used as a supply power in case of emergency (S704).

Then, even after the surplus power sale or power storage process is completed, the operation priority between the electrical products is continuously determined, and whether or not the priority is changed (S705).

On the other hand, as shown in Figure 8 by comparing the amount of power supply and the expected power consumption, if there is a shortage occurs to determine the priority between the electrical appliances (S801), the operation of the electrical products of the last priority among the electrical appliances currently in operation Stop or perform the power consumption minimization operation (S802).

Then, the electric appliances to be stopped or minimized in power consumption are displayed on the energy management device (EMS), and an alarm / display device attached to the electric appliances itself is used to inform the user that the electric appliances have been controlled (S803). ).

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

For example, if the first priority is set to the refrigerator, the second is the air conditioner, the third is the washing machine, the fourth is the washing machine, the fifth is the dryer, and all the electrical appliances are in operation, When the supply power is insufficient, the operation of the dryer is suspended or the heater is minimized to generate heat.

After stopping or minimizing power consumption for the last-ranked electrical appliance, the supply power and the expected required power are again compared (S804), and surplus power is generated, and the surplus power is stopped or the power consumption is minimized. Is determined to be greater than the expected amount of power of the highest priority electrical appliance (the amount of power required to implement the operation state immediately before stopping or minimizing power consumption) (S805). Go through the process (S806).

On the other hand, if the energy management mode is selected, and the expected power consumption (power charge) is set, but the priority between the electrical appliances is not set, as shown in Figure 9 by comparing the power supply and the expected power consumption (S901) When the surplus power is generated, it is determined whether the power resale function is selected (S903), the surplus power is stored according to the result (S905), or the surplus power is sold to the power company (S904).

In addition, when the surplus power does not occur, but rather the supply power is insufficient, it is preferable to operate in a preset power consumption mode for each electric product in operation (S902).

That is, in such a case, in the case of the refrigerator, the number of defrosting operations is minimized, in the case of the air conditioner, the operation frequency of the compressor is minimized, and in the case of the clothes dryer, when only one heater is configured, only one is operated. The case can be assumed.

In addition, when the energy management mode is set, but the estimated required power amount (electric charge) is not set, it is preferable to control to operate in the standard setting mode for each electric product as shown in FIG. 10 (S1001).

For example, in the case of an air conditioner, when the minimum cooling temperature is set to 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 the refrigerator, it can be said that the operation of the refrigerator so that the number of defrosting operations in the refrigerator is about halfway between the minimum and maximum times.

In addition, a washing machine, a cooking appliance, or the like may be regarded as a standard setting mode in which a median value between a section where the power consumption is maximum and a section that is the minimum is about.

Accordingly, the smart meter and the energy management device (EMS) determine the current time is the power consumption peak time (electric charge progressive period) supply while each electric appliance is driven in the standard setting mode (S1002), the power consumption peak time If it is determined that the user is notified of this through an alarm or other visual indication (S1003).

That is, as shown in FIG. 12, when the power consumption reaches the highest point between 12 and 18 o'clock, and the electricity rate per hour increases in conjunction with the power consumption, the user can recognize this and save the electric charge in consideration of this. To guide.

Accordingly, the user may recognize that the current time is the power consumption peak time, and may stop some operation of the electrical appliance or operate in the power consumption mode to save the electric charge.

On the other hand, as shown in Figures 6 and 11, if the user does not even select the energy management mode, each electrical appliance is the operating mode initially set by the user regardless of whether the current time has reached the power consumption peak time As it is driving (S1101).

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 11 are control flowcharts illustrating a control method of the power supply network system of the present invention.

12 is a graph of power consumption and electricity charges over time of electric power.

<Description of Main Parts of the Present Invention>

20: smart meter 30: energy management system

34: communication unit 34: control unit

38: input unit 39: display unit

40: storage battery

Claims (16)

In the control method of the power supply network system for connecting a plurality of electrical appliances and supplying power to the plurality of electrical appliances, Determining whether an energy management mode is selected for saving electric charges and power consumption in the power network system; When the energy management mode is selected, the amount of power consumed by the electric appliance being driven is determined according to the amount of power supplied to the power supply network system or the time of power supply, whether to set the operation priority of the electrical appliance connected to the power supply network, and the set operation priority. Control method of power supply network system to control. The method of claim 1, When the energy management mode is selected, Determining whether the user has set an expected required amount of electricity or an electric charge; Determining whether the priority of the operation between the connected electric appliances is set when the expected amount of electric power or the electric charge is set; The control method of the power supply network system to control the operation of the plurality of electrical appliances in consideration of the power supplied to the power supply network system and the estimated power consumption when the priority is set. The method of claim 2, The estimated power consumption is a control method of a power supply network system, characterized in that calculated by the average day of the week or season use frequency of the electrical appliances accumulated in the control unit of the power supply network and the power consumption during use. The method of claim 2, In the case where the operation priority between the connected electrical appliances is set, controlling the operation of the electrical appliances includes: Identifying the number of connected electrical appliances; Transmitting and receiving priorities of operation and power information in each electric appliance; When surplus power is generated by comparing the power supplied to the power supply network system with the expected power consumption, and determining whether to resell the power, accumulate surplus power or resell surplus power to the power company. Control method of a power supply network system comprising a. The method of claim 4, wherein After the step of accumulating surplus power or reselling it to a utility company, it is determined whether there is a change in the operational priority of the electric appliance continuously, and according to the result, the estimated power consumption is adjusted, and the adjusted value and supply power are continuously adjusted. The control method of the power supply network system, characterized in that for controlling a plurality of electrical appliances in comparison. The method of claim 4, wherein As a result of comparing the estimated power consumption with the power supplied to the power supply network system, when the estimated power consumption is large and the power is insufficient, Identifying operational priorities between electrical appliances; A method of controlling a power supply network system, further comprising the step of stopping the operation of the last ranked electrical appliance among the electrical appliances in operation. The method of claim 6, After the shutdown of the last-ranked electrical appliance, if it is determined that the power supply is insufficient as a result of comparing the amount of power supplied to the estimated power required again, And stopping the operation of the next highest priority electrical appliance among the electrical appliances in operation. The method of claim 7, wherein After the shutdown of the last-ranked electrical appliance, surplus power is generated as a result of comparing the amount of power supplied to the estimated power required again. When surplus power is larger than the expected power consumption of the highest rated electrical appliance of the ordered shutdown, A method of controlling a power supply network system, characterized by operating the highest rated electrical appliance of a given electrical stop command. The method of claim 2, It is determined that the priority of operation between electrical appliances is not set, If it is determined that the amount of power supply is insufficient by comparing the amount of power supplied and the expected amount of power, the control method of the power supply network system, characterized in that the control to operate in the minimum power consumption mode for each electrical product. The method of claim 2, It is determined that the priority of operation between electrical appliances is not set, When it is determined that surplus power is generated due to the remaining amount of supply power compared to the amount of power supplied and the required amount of power, the power characterized by storing surplus power or reselling surplus power to a power company according to whether the power resale function is selected. Control method of supply network system. The method of claim 2, If the energy management mode is selected, but it is determined that the user has set an expected required amount of electricity or an electric charge, it is determined that such setting is not made. Operating in a basic setting mode for each electric product; Determining whether the current time is the power consumption peak time, and if the power consumption peak time is determined, notifying the user through an alarm. A power supply source; A power smart meter that performs bidirectional communication with the power supply and measures power in real time; And an energy management device connected to the power smart meter and controlling the operation of the plurality of electrical appliances by comparing the power information of the plurality of electrical appliances with the power information supplied from the outside. The energy management device compares the estimated required power amount and the power supply amount set by the user to operate the electric products according to the set operating priority of the plurality of electric products or notify the lack of power supply when the supply power amount is small. Power supply network system. The method of claim 12, 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 smart meter 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 power of the electrical appliance. The method of claim 12, 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 products to be constantly supplied. The method of claim 12, And a storage battery connected to the smart meter and the energy management device so as to accumulate the power when the surplus power is generated by the command of the energy management device.

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