KR102419665B1 - Method of demand response for facilities having plural operation modes and its management system - Google Patents

Abstract

In the DR management method for facilities having a plurality of operation modes, when a DR resource group is made up of facilities having a plurality of operation modes, when a demand reduction instruction including the amount of power to be reduced and the reduction duration is received, the DR resource group is operated among the facilities selecting at least one or more facilities whose mode is the first mode; determining, among the selected facilities, a facility having a large ratio of the remaining first mode running time as a control priority object; Calculating the control amount and control time based on the control time and the first mode progress time, and transmitting the reduction request signal generated in response to the calculated control amount and the control time to the facility determined as the control priority target to implement control including the steps of

Description

Demand response management method for facilities having a plurality of operation modes and a demand response management system employing the same

The present invention relates to Demand Response (hereinafter abbreviated as DR) management, and more particularly, when a DR resource consists of facilities having a plurality of operation modes, the quality is not affected by the demand reduction instruction. It relates to a demand response management method that can increase the response speed and reduction implementation rate within the scope that is not available, and a demand response management system employing the same.

DR is a system in which the government can order a company contracted in advance to stop using electricity for a certain period of time in order to supply electricity stably when electricity demand temporarily increases. show DR reduces the construction of new power plants by inducing reasonable energy consumption, and is being promoted in connection with various new energy projects such as greenhouse gas reduction, energy storage and energy management systems.

On the other hand, peak reduction DR is a method that contributes to supply stabilization by requesting companies to reduce electricity when the power supply and demand situation changes rapidly. An example of this method is the dispatch order, which is an issue every year. Peak reduction DR is divided into standard DR and small and medium-sized DR according to the size of the resource capacity. In terms of implementation, the general DR method, that is, the power supply of the load corresponding to the contracted capacity based on the order of power supply from KEPCO 1 to 2 hours before. There is a method that stops supply and a fast DR method that responds to a power supply within up to 10 minutes. Among them, fast DR is a resource that needs to respond quickly, for example, within 10 seconds to 10 minutes, at an Auto or similar level, and reliability is of utmost importance. This advantage is considered as an essential factor in responding to the volatility of new and renewable energy because it can be used as a sure card during power peaks.

In relation to peak reduction DR, if a company is expelled from resources due to a low fulfillment rate upon request for reduction, companies that participated in the DR market will be restricted from trading electricity within the DR market, and will not be able to receive settlement money, that is, not only performance money but also basic money. Meanwhile, the demand management operator calculates the amount of electricity that a company can save between the government and the company, collects them, forms resources, and provides overall management, such as requesting reduction from the company when a reduction request is issued.

In recent years, there is a tendency to request for power reduction more frequently than in the past due to heat waves or unusual cold waves, so a technology that can realize a rapid response and high reduction implementation rate to demand reduction orders within the range that does not affect the production plan and quality and the need for a method is emerging.

Korean Patent Publication No. 10-1626088 Korean Patent Publication No. 10-2019-0041266

An object of the present invention, which was devised to satisfy the above needs, is to reduce the response speed and reduction within the range that does not affect the quality with respect to the demand reduction instruction when the demand response resource consists of facilities having a plurality of operation modes. An object of the present invention is to provide a DR management method capable of increasing the implementation rate and a DR management system employing the same.

The demand response management method for facilities having a plurality of operation modes according to the present invention for achieving the above object is a demand including the amount of reduced power and the reduction duration when the DR resource group is made up of facilities having a plurality of operation modes. selecting at least one facility whose operation mode is a first mode from among the facilities when a reduction instruction is received; determining, as a control priority target, a facility having a large ratio of remaining first mode running time among the selected facilities; calculating a control amount and a control time based on the maximum control amount, the maximum control time, and the first mode progress time of the facility determined as a control priority object; and transmitting a reduction request signal generated in response to the calculated control amount and control time to the facility determined as the control priority target to implement control.

Preferably, the method can be applied to fast-DR mode.

More preferably, the maximum control amount of the equipment may be set in proportion to the maximum output of the equipment, and the maximum control time may be set based on the maximum duration of the first mode of the equipment.

According to the present invention for achieving the above object, there is provided a DR management system for facilities having a plurality of operation modes, comprising: a DR resource group comprising facilities having a plurality of operation modes; and a DR management server that provides a DR management service to the facilities, wherein the DR management server has an operation mode in the first mode when a demand reduction instruction including a reduced power amount and a reduction duration is received. At least one or more facilities are selected, and a facility having a large ratio of remaining first mode running time is determined as a control priority target among the selected facilities, and the maximum control amount, maximum control time, and first mode progress time of the facility determined as the control priority target Based on the calculation of the control amount and control time, the control is implemented by transmitting a reduction request signal generated in response to the calculated control amount and control time to the facility determined as the control priority target.

According to the present invention, when the DR resource is composed of facilities having a plurality of operation modes, the control priority is automatically and quickly determined within the range that does not affect the quality in response to the demand reduction instruction, thereby performing control. , the response speed and reduction implementation rate can be greatly increased.

According to the present invention, by enabling automatic control through the control implementation scheduling for the demand reduction instruction, the demand management service provider can easily manage the DR resource group.

1 is a view for explaining a standard operating cycle of the foundry melting process.
2 is a diagram illustrating a concept of a DR management system for facilities having a plurality of operation modes according to an embodiment of the present invention.
3 is a view showing an example of the electric furnace module shown in FIG.
4 is a block diagram showing the configuration of a DR management server according to an embodiment of the present invention.
FIG. 5 is a view showing examples of parameters constituting a database included in the storage unit shown in FIG. 4 .
6 is a flowchart illustrating an operation of a DR management method for facilities having a plurality of operation modes according to an embodiment of the present invention.
7 is a view for explaining the detailed operation of step 630 shown in FIG.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements. Various changes may be made to the embodiments, and it is not intended to be limited to the embodiments, but it should be understood to include all changes, equivalents or substitutes for these. Terms used in the examples are used only to describe specific examples, and are not intended to limit the examples. The singular expression includes the plural expression unless the context clearly dictates otherwise.

1 is a view for explaining a standard operating cycle of the foundry melting process.

In general, the steel and metal sectors show a steady annual demand for electricity as a continuous process like the chemical sector. consumes Referring to FIG. 1 , in the standard operation of melting and tapping in a foundry, the output of the electric furnace is set to, for example, 3,450 kW at the maximum after the scrap iron is charged and maintained for 60 minutes until the melting is completed. After that, samples are collected by setting the output to 0 for about 3 minutes, and the output is reduced in stages from the 1st tapping to the 4th tapping in consideration of the amount of remaining hot water that is reduced for thermal insulation. And, after the last tap, the cycle is made to maintain the minimum output for keeping warm until the next charging with respect to the minimum amount of residual hot water. In the standard operation cycle, the dissolution process will be referred to as a first mode, that is, a temperature increase (PF) mode, and the heat retention process will be referred to as a second mode, that is, a keep warm (PM) mode.

2 is a diagram illustrating the concept of a DR management system for facilities having a plurality of operation modes according to an embodiment of the present invention, and includes a DR management server 210 , a communication network 230 , and a DR resource group 250 . can

In FIG. 2 , the DR management server 210 is operated by a demand management operator or a DR resource operator in a contractual relationship with the demand management operator, and controls the DR resource group 250 through the communication network 230 . Specifically, the DR management server 210 provides a DR management service to the DR resource group 250 . The DR management service derives a control implementation schedule when a demand reduction instruction is received from a government agency or a demand management service provider, and among facilities having a plurality of operation modes included in the DR resource group 250, the reduction included in the demand reduction instruction This includes transmitting a reduction request signal to the facility included in the control implementation schedule through the communication network 230 until the amount of electricity and the reduction duration are satisfied. In addition, the DR management server 210 may update the contracted amount of reduced power and the reduction duration while discovering DR resources and additionally registering them with a government agency or a demand management company. In addition, the DR management server 210 may analyze the result of the control implementation and provide result analysis information and information on payment of settlement money to the member company that has implemented the control in response to the reduction request signal.

The communication network 230 may be a wireless network, a wired network, or a combination of wired and wireless networks, or may include a publicly accessible network, for example, the Internet. The communication network 230 connects the DR management server 210 and the DR resource group 250 .

The DR resource group 250 consists of facilities or facilities having a plurality of operation modes owned by member companies of the demand management service provider. Here, the facilities constituting the DR resource group 250 may be provided from a single workplace or from a plurality of workplaces having at least one facility. The plurality of operation modes may include a first mode in which a specific output is provided for each mode, which is a temperature increase ( _PF ) mode, and a second mode, which is a keep warm ( _PM ) mode. In addition, the plurality of operation modes may further include a preheating mode as the third mode. Here, the first mode may mean a mode requiring the greatest output or power among the plurality of operation modes. Meanwhile, the facilities may be of the same type or different types of facilities. According to one embodiment, if the member companies are business operators engaged in the steel or metal field, an electric furnace having a plurality of operation modes may be a DR resource. Hereinafter, for convenience, a case in which the DR resource is an electric furnace will be described as an example.

DR resource group 250 includes an electric furnace module 290 including a plurality of electric furnaces 291,293,295,297 and a plurality of controllers 271,273,275,277 for controlling the electric furnace in response to the plurality of electric furnaces A control module 270 including a include In the control module 270, each control unit (271,273, 275,277) reduces the power supply amount to the electric furnace corresponding to the control time calculated for the electric furnace (291,293,295,297) in response to the reduction request signal received from the DR management server (210). In addition, each control unit (271,273,275,279) transmits information on the operation status of each electric furnace (291,293,295,297) for each preset unit time to the DR management server (210).

3 is a view showing an example of the electric furnace module 290 shown in FIG.

Referring to FIG. 3 , the electric furnace units 1 to N (291,293, 295,297) constituting the electric furnace module 290 control the variable resistance with contact control to apply a digital control method of the output (Electrical Induction). Furnace, EIF), but is not limited thereto. According to one embodiment, all of the furnace units 1 to N (291,293, 295,297) may be formed of a 1-source 1-body or 1-source 2-body, but is not limited thereto. According to another embodiment, the electric furnace units 1 to N (291,293, 295,297) may be a 1-source 1-body or 1-source 2-body, or a mixture of other types of electric furnaces.

4 is a block diagram illustrating the configuration of the DR management server 210 according to an embodiment of the present invention, and includes a communication unit 410 , a control unit 430 , and a storage unit 450 .

Referring to FIG. 4 , the communication unit 410 receives a demand reduction instruction including an amount of reduced power and a reduction duration, and transmits a reduction request signal generated in response to the demand reduction instruction to the DR resource group 260 . In addition, the communication unit 410 receives information on the operation status of each electric furnace (291,293, 295,297) for each preset unit time from each control unit (271,273,275,277) of the DR resource group 260.

When the control unit 430 receives a demand reduction instruction including the amount of reduced power and the reduction duration, the operation mode is the first mode, that is, at least one electric furnace that is a temperature increase mode among a plurality of electric furnaces constituting the DR resource group 250 select The control unit 430 determines, as a priority control target, an electric furnace having a large ratio of the remaining first mode running time among the selected electric furnaces. The control unit 430 calculates the control amount and the control time based on the maximum control amount, the maximum control time, and the first mode progress time of the electric furnace determined as the control priority object, and generates a reduction request signal generated in response to the calculated control amount and the control time. Control is performed by transmitting to the electric furnace determined as the control priority object. The control unit 430 calculates the control amount and the control time by determining a control priority for each preset unit time until the calculated sum of the control amount is greater than the reduced power amount and the calculated sum of the control time becomes greater than the reduction duration time. do.

The storage unit 450 may store member company information, information on the operation status of the electric furnace owned by the member company, and power for each electric furnace contracted by each member company, that is, the maximum control amount (Pmax) and the maximum control time (Tmax). In addition, the storage unit 450 may store various programs related to the demand management service provided by the demand management service provider. Information on the operation status of the electric furnace owned by the member company may be received from the DR resource group (250 in FIG. 2 ) for each preset unit time and stored in a database. Here, the maximum control amount Pmax may be set in proportion to the maximum output of the electric furnace. According to one embodiment, the maximum control amount (Pmax) may be set to 20% of the maximum output of the electric furnace, or may be adjusted through consultation with member companies. The maximum control time (Tmax) may be set based on the maximum temperature increase duration of the electric furnace. On the other hand, the storage unit 450 may be configured as a web cloud server to store or read information about the operation status of each electric furnace that is embedded in the DR management server 210 or updated in real time.

FIG. 5 is a diagram showing examples of parameters constituting a database included in the storage unit 450 shown in FIG. 4 .

The database stores the information on the operation status of each electric furnace as a parameter, and the information on the operation status of each electric furnace includes data collection time for each unit time, the amount of electricity, the first mode, that is, the temperature increase mode or the second mode, that is, the keep mode, the temperature increase It may include, but is not limited to, time or keeping time, and the weight of the molten metal.

Taking the first body (EIF1-1) of Electric Furnace Unit 1 as an example, in the first data collection time T ₁ , the amount of power is P ₁ , the temperature increase (P _F ) mode, the temperature increase time is the start stage (F ₁ ), and the weight of the molten metal is Recorded as W ₁ and taking the second body (EIF1-2) of Electric Furnace Unit 1 as an example, in the first data collection time T ₁ , the amount of power is P ₁ , the keep warm (P _M ) mode, and the keep warm time is the starting stage (M ₁ ), the molten metal weight is recorded as W ₁ .

6 is a flowchart illustrating an operation of a DR management method for facilities having a plurality of operation modes according to an embodiment of the present invention, and a program for implementing this may be executed in the DR management server 210 .

Referring to FIG. 6 , in step 610, a demand reduction instruction including the amount of power to be reduced (P _R ) and the duration of reduction ( _TR ) is received from a government agency such as a power exchange.

In step 630, a control transition schedule for controlling the DR resource group 250 is generated in response to the demand reduction instruction. The control implementation schedule first selects at least one facility whose operation mode is the first mode among the facilities having a plurality of operation modes constituting the DR resource group 250, and the ratio of the remaining first mode progress time among the selected facilities is A large facility is determined as a control priority object, and the control amount and control time are calculated based on the maximum control amount (Pmax) and maximum control time (Tmax) of the facility determined as the control priority object and the first mode progress time, and Until the sum is greater than the amount of reduced power PR and the sum of the calculated control times is greater than the reduction duration TR, a control priority is determined for each preset unit time to calculate a control amount and a control time. According to an embodiment, the unit time may correspond to a period in which information on the operation status of each facility is updated in the database.

In step 650, the control is performed in response to the control amount and control time calculated in step 630. In the control implementation, the reduction request signal generated in response to the calculated control amount and control time is transmitted to the facility determined as the priority target for control, and the reduction request signal is implemented from the DR resource group 250 having the facility to which the reduction request signal is transmitted. It may include the process of receiving a confirmation signal that this is possible. According to another embodiment, the control implementation may include only the process of transmitting the reduction request signal to the facility determined as the priority target for control without the process of receiving a separate confirmation signal.

In step 670 , it is determined whether the requested amount, that is, the amount of reduced power (PR ) and the reduction duration ( _{TR )} can be achieved, as a result of the control implementation in step 650 . When the amount of control implemented to date is greater than the amount of reduced power (PR ) and the control time implemented to date is greater than the reduction duration ( _{TR )} , it may be determined that the control implementation is complete. On the other hand, if the sum of the next control amount derived from the control implementation schedule and the control amount implemented to date is greater than the amount of reduced power (PR ), and the sum of the next control time and the control time implemented to date is greater than the reduction duration ( _{TR )} By performing the next control, it can be determined that the control transition has been completed. If it is determined in step 670 that it is determined that the requested amount, that is, the amount of power to be reduced (P _R ) and the duration of reduction ( _TR ) cannot be achieved, as a result of the control implementation in step 650, the process returns to step 630 .

In step 690, if it is determined that the requested amount, that is, the amount of reduced power (P _R ) and the reduction duration ( _TR ) can be achieved, as a result of the control implementation in step 650 in step 670, the control implementation is completed, while in step 610 A response to the received demand reduction instruction is notified to the Korea Power Exchange or a demand management company.

7 is a view for explaining the detailed operation of step 630 shown in FIG.

In step 710, the DR resource group (250 in FIG. 2) with reference to the database included in the storage unit 50 at the time of receiving the reduced power amount (PR) and the reduction instruction duration (TR) based on the current time (TF) ), select the equipment in the first mode.

In operation 730 , a control priority target for calculating the first control amount Pe ₁ and the first control time Te ₁ is determined among the facilities in the first mode selected in operation 710 . According to an embodiment, a facility having a small first mode running time, for example, a facility having a large ratio of the remaining first mode running time, may be determined as a control priority target. Here, when the ratios of the remaining first mode progress times of the facilities in the first mode selected in step 710 are the same, the control priority object may be a plurality of facilities. The first mode progress time may be obtained by subtracting the first mode start time T _S from the current time T _F . As described above, the equipment having a large ratio of the remaining first mode progress time can secure a relatively large amount of time required for transitioning to a subsequent step, thereby minimizing the impact on the quality of the result. Specifically, when the equipment in the first mode selected in step 710 is the first body EIF1-1 of the first electric furnace unit 1 and the first body EIFN-1 of the electric furnace unit N, the following Equation 1 is obtained. If satisfied, the first body (EIF1-1) of the electric furnace unit 1 may be determined as a priority target for control. Here, the maximum control time of the first body (EIF1-1) of the electric furnace unit 1 is [EIF1-1]T _max , and the heating progress time is ([EIF1-1]T _F - [EIF1-1]T _S ) and the maximum control time of the first body (EIFN-1) of the electric furnace unit N is [EIFN-1]T _max , and the first mode progress time is ([EIFN-1]T _F - [EIFN-1]T _S ) is called

On the other hand, when the ratio of the remaining first mode progress time is less than the minimum allowable ratio, for example, 10%, the control priority may be excluded. Specifically, when the following Equation 2 is satisfied, the first body EIFN-1 of the electric furnace unit N may be excluded from the control priority.

Here, K represents the minimum allowable ratio, and may have a different value depending on the capacity of each facility, that is, the maximum output or the maximum first mode running time, or may have a fixed value for all facilities.

In step 750, a control implementation schedule is derived based on the facility determined as a control priority target in step 730. The control implementation schedule may include a process of calculating a control amount and a control time that satisfy the reduced power amount (PR ) and the reduction instruction duration ( _{TR )} . Specifically, when the first body EIF1-1 of the first electric furnace unit EIF1-1 is determined to be a control priority in step 730, the first control amount Pe ₁ and the first control time Te ₁ are calculated as in Equation 3 below. can do.

On the other hand, when both the first body (EIF1-1) of the electric furnace unit 1 and the first body (EIFN-1) of the electric furnace unit N are determined to be priority objects in step 730, the first control amount Pe ₁ and the first control The time Te ₁ may be calculated as in Equation 4 below.

When the first control amount (Pe ₁ ) calculated by Equation 3 or 4 is less than the amount of reduced power (P _R ) or the first control time (Te ₁ ) is less than the reduction duration ( _TR ), return to step 710 and repeat The equipment in mode 1 is selected, and in step 730, a control priority target for calculating the second control amount (Pe ₂ ) and the second control time (Te ₂ ) is determined, and as in Equation 3 or 4, the second control amount (Pe ₂ ) and A second control time Te ₂ is calculated. Next, the control amount that is the sum of the first control amount (Pe ₁ ) and the second control amount (Pe ₂ ) is less than the reduced power amount ( _PR ), or the control time that is the sum of the first control time (Te ₁ ) and the second control time (Te ₂ ) continues to be reduced If it is less than the time T _R , steps 710 to 730 are repeatedly performed. And, the sum of the accumulated control amount from the first control amount including the nth control amount that has completed the control transition is greater than the amount of reduced electric power ( _PR ), and the accumulated control time When the sum is greater than the reduction duration T _R , steps 710 to 730 are terminated.

In the above embodiment, it is exemplified that a plurality of electric furnaces, which are demand response resources, are classified into one group and collectively controlled. It is also possible to implement a method of classifying into small groups and giving a reduction instruction by allocating them to small groups according to the amount of reduction requested.

An embodiment of the present invention includes a computer-readable storage medium in which a program for performing various computer-implemented operations is recorded. The storage medium records a program for executing the above-described demand response management method for an electric furnace. The storage medium may include program instructions, data files, data structures, etc. alone or in combination. Examples of such storage media include hard disks, magnetic media such as floppy disks and magnetic disks, optical recording media such as CDs and DVDs, floppy disks and magneto-optical media, ROM, RAM, flash memory, or web cloud server, etc. There is a hardware device configured to store and execute program instructions. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

Although the embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the technical idea of the present invention defined in the claims may also be included.

210 ... DR management server 230 ... communication network
250 ... DR resource group 410 ... Department of Communications
430 ... control unit 450 ... storage unit

Claims (5)

When the DR resource group consists of facilities having a plurality of operation modes, when a demand reduction instruction including the amount of reduced power and the reduction duration is received, at least one facility whose operation mode is the first mode is selected from among the facilities step;
determining, as a control priority target, a facility having a large ratio of remaining first mode running time among the selected facilities;
calculating a control amount based on a maximum control amount of the facility determined as a control priority object, and calculating a control time based on the maximum control time of the facility determined as a control priority object and a first mode progress time; and
Transmitting a reduction request signal generated in response to the calculated control amount and control time to the facility determined as the control priority target to implement control,
A method for managing demand response of facilities having a plurality of operation modes, characterized in that, among the selected facilities, facilities having a ratio of the remaining first mode running time less than a preset minimum allowable ratio are excluded from the control priority target. The method according to claim 1, wherein the method is applied to a fast-DR mode. The plurality of operation modes according to claim 1, wherein the maximum control amount of the equipment is set in proportion to the maximum output of the equipment, and the maximum control time is set based on the maximum first mode duration of the equipment. A method for managing demand response of equipments. The method according to claim 1, wherein the facilities constituting the DR resource group are provided by a single workplace or are provided by a plurality of workplaces having at least one facility. a DR resource group consisting of facilities having a plurality of operation modes; and
A DR management server that provides a DR management service to the facilities;
The DR management server is
When the demand reduction instruction including the amount of power to be reduced and the duration of reduction is received, at least one facility whose operation mode is the first mode is selected from among the facilities,
Determining a facility with a large ratio of the remaining first mode running time among the selected facilities as a control priority target;
Calculating the control amount based on the maximum control amount of the equipment determined as the control priority object, calculating the control time based on the maximum control time of the equipment determined as the control priority object and the first mode progress time,
Transmitting a reduction request signal generated in response to the calculated control amount and control time to the facility determined as the control priority target to perform control,
Demand response management system for facilities having a plurality of operation modes, characterized in that, among the selected facilities, facilities having a ratio of remaining first mode running time less than a preset minimum allowable ratio are excluded from control priority.

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