Device for controlling power and operation method thereof

Abstract

A device for controlling power according to one aspect comprises: a communication unit connected to a virtual power plant (VPP) operating system and an energy storage system (ESS) to transmit and receive information; and a processor for initiating an operation by using a control signal received from the virtual power plant operating system via the communication unit, calculating second power information on the basis of a frequency adjustment offset value determined according to a frequency included in first power information, and controlling the communication unit so that the second power information is transmitted to the energy storage system.

Description

Device for controlling power and method of operation thereof

[0001] The present disclosure relates to a power control device and an operating method thereof. Specifically, the present disclosure relates to a device for frequency regulation and power quality monitoring in conjunction with an energy storage system (ESS), and an operating method thereof.

[0002] When performing frequency control ancillary services (FCAS) through the interconnection of energy storage systems (ESS) and the power grid, there are limitations, such as the need for a separate energy gateway or the use of a third-party gateway. Furthermore, clustering residential ESS products from various manufacturers and forming a virtual power plant (VPP) is complex, hindering entry into the FCAS market.

[0003] The background technology described above is technical information that the inventor possessed for the purpose of deriving the present disclosure or acquired in the process of deriving the present disclosure, and cannot necessarily be considered as publicly known technology disclosed to the general public prior to the filing of the present disclosure.

[0004] The primary objective of the present disclosure is to facilitate entry into and management of the FCAS market by providing a function that enables real-time response to frequency adjustments using a power control device and easily forms a VPP cluster by integrating products from various manufacturers.

[0005] The problems to be solved by this disclosure are not limited to those mentioned above. Other problems and advantages of this disclosure not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of this disclosure. Furthermore, it will be appreciated that the problems and advantages to be solved by this disclosure can be realized by the means and combinations thereof set forth in the claims.

[0006] A device for controlling power according to one aspect includes a communication unit that is connected to a virtual power plant (VPP) operating system and an energy storage system (ESS) and transmits and receives information; and a processor that initiates an operation by a control signal received from the virtual power plant operating system through the communication unit, calculates second power information based on a frequency adjustment offset value determined according to a frequency included in first power information, and controls the communication unit so that the second power information is transmitted to the energy storage system.

[0007] A method of operating a device for controlling power according to another aspect includes: initiating an operation by a control signal received from a virtual power plant operating system (VPP); calculating second power information based on a frequency adjustment offset value determined according to a frequency included in first power information received from a measuring unit; and transmitting the second power information to the energy storage system (ESS).

[0008] In another aspect, another computer-readable recording medium includes a recording medium having recorded thereon a program for executing the above-described method on a computer.

[0009] In addition, other methods for implementing the present disclosure, other systems, and computer-readable recording media storing a computer program for executing the method may be further provided.

[0010] Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims and detailed description of the invention.

[0011] According to the present disclosure, a power control device can monitor the frequency of a grid in real time and provide information for frequency adjustment in conjunction with an energy storage system (ESS), thereby compensating for frequency imbalance and improving power quality.

[0012] In addition, by linking the power control device with the ESS to monitor the frequency of the grid in real time and provide information for frequency adjustment, it becomes easier for the energy storage system (ESS) to participate in the FCAS market and implement the FCAS function more effectively.

[0013] Additionally, the power control device can easily integrate home ESS products from various manufacturers to form a VPP cluster, providing an environment in which various products can be integrated and cooperate in the energy market.

[0014] Additionally, it will enable ESSs without FCAS functionality to participate in the FCAS market, simplifying and improving operations and management in the FCAS market.

[0015] Additionally, frequency regulation can be performed more quickly through a power control device, thereby improving the power quality of the system and maintaining stability.

[0016] The effects of the present disclosure are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

[0017] Figure 1 is a configuration diagram of a typical household hybrid ESS.

[0018] FIG. 2 is a drawing illustrating an example of a power system measurement environment using a power control device according to the present disclosure.

[0019] FIG. 3 is a block diagram schematically illustrating an example of a device for controlling power according to the present disclosure.

[0020] FIG. 4 is a flowchart illustrating an example of an operation method of a device for controlling power according to the present disclosure.

[0021] FIG. 5 is a flowchart illustrating another example of an operation method of a device for controlling power according to the present disclosure.

[0022] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments presented below, but may be implemented in various different forms, and it should be understood that it includes all transformations, equivalents, and substitutes included in the spirit and technical scope of the present disclosure. The embodiments presented below are provided to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the present disclosure of the scope of the disclosure. In describing the present disclosure, if a detailed description of a related known technology is determined to obscure the gist of the present disclosure, the detailed description thereof will be omitted.

[0023] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, it should be understood that the terms "comprise" or "have" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used solely for the purpose of distinguishing one component from another.

[0024] Additionally, in the present disclosure, a “part” may be a hardware component such as a processor or circuit, and / or a software component executed by a hardware component such as a processor.

[0025] In the following disclosure, the terms "first," "second," etc. are not used in a restrictive sense, but rather to distinguish one component from another. In the following disclosure, singular expressions include plural expressions, unless the context clearly indicates otherwise.

[0026] In some embodiments, where the implementation is otherwise feasible, a particular process sequence may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0027] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the attached drawings. In describing with reference to the attached drawings, identical or corresponding components are assigned the same drawing numbers, and redundant descriptions thereof will be omitted.

[0028] In the following examples, terms such as "first," "second," etc. are not used in a limiting sense, but rather to distinguish one component from another. In the following examples, singular expressions include plural expressions, unless the context clearly indicates otherwise.

[0029] In the following examples, terms such as “include” or “have” mean that a feature or component described in the specification is present, and do not preclude the possibility that one or more other features or components may be added.

[0030] In some embodiments, where the implementation is otherwise feasible, a particular process sequence may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0031] Figure 1 is a schematic diagram of a typical household hybrid ESS. Referring to Figure 1, the ESS (110) configures an energy meter (130) in front of the power system with a load (120) in between, and can obtain information on the system's voltage, current, frequency, active power, reactive power, apparent power, and power factor through communication (RS485 / WiFi, Modbus RTU / TCP). For example, the ESS (110) can calculate the load according to the following mathematical equation 1 using the obtained information.

[0032]

[0033] Referring to mathematical expression 1, the basic operation of ESS (110) DML is to control the active power (Inverter Active Power) of ESS (110) by the calculated load so that the grid active power (Active Power) measured by the energy meter (130) becomes 0.

[0034] The FCAS function for power system quality exists in some products that are supported by the ESS (110) itself by linking with the manufacturer's cloud, and in others, the function is not supported by the ESS (110) itself, or 3 rd It provides frequency adjustment function by linking with party gateway.

[0035] However, the ESS system itself does not support the FCAS function. rd Equipment that is not compatible with party gateways has difficulty entering the FCAS market.

[0036] Furthermore, for residential ESS products with lower capacity compared to commercial and industrial (C&I) or public power suppliers or utilities, regional clustering, such as virtual power plants (VPPs), is required to perform FCAS functions, enabling power output from a frequency regulation perspective. However, integration challenges arise when interoperating with products from different manufacturers or when integrating with cloud systems from different manufacturers.

[0037] To address these challenges, a solution is required that allows easy control of products from various manufacturers and integration of VPP units.

[0038] FIG. 2 is a drawing illustrating an example of a power system measurement environment using a power control device according to the present disclosure.

[0039] In the following description, any part that overlaps with the description of FIG. 1 will be omitted. Referring to FIG. 2, a power system measurement environment using a power control device according to the present disclosure may include a VPP operating system (210), an ESS (220), a power control device (230), and a load (240). For example, the power control device (230) may be a smart power meter, but is not limited thereto.

[0040] In FIG. 2, the Grid may include a system that generates and transmits power. A photovoltaic (PV) generator may convert solar energy into electrical energy and transmit it to an energy storage system (ESS) (220). A battery may be connected to the ESS (220) to generate or charge power.

[0041] The VPP operating system (210) can issue a power management activation control command (signal) for frequency regulation to a power controlling device (230) when energy trading is required in the FCAS market, thereby enabling the power controlling device (230) to activate the power management function for frequency regulation.

[0042] The ESS (220) can supply (generate) power stored in the battery to the grid or take electric energy from the grid and store (charge) it in the battery based on second power information received from a power control device (230). Here, the second power information can include a signal that controls the power generation or charging operation of the ESS (220).

[0043] ESS (220) can obtain information on voltage, current, frequency, reactive power, active power, apparent power, and power factor of the system through a power control device (230). Basically, based on the active power information measured in the system, the load (240) is calculated (load = ESS active power + system active power) and the power generation amount of ESS (220) is controlled. Meanwhile, the frequency control function means that in Korea, the system standard frequency must be maintained at 60±0.5Hz, and may include a method for compensating for such unbalanced power in real time due to a mismatch between supply and demand in the power supply system. When the system frequency drops, the active power of ESS (220) is supplied to the system, and when the frequency rises, energy is stored through ESS (220), thereby compensating for energy imbalance.

[0044] The power control device (230) monitors the frequency of the grid in real time and includes a function that controls the grid current and active power information provided to the ESS (220) to enable frequency adjustment. As an example of grid active power, a frequency adjustment offset value may be added to the active power value measured in the existing grid to control the power generation of the ESS (220) to enable load response and frequency adjustment response, thereby satisfying the power grid quality.

[0045] When the market price for frequency adjustment from the upper power trading system is good and the grid frequency is lower than the standard frequency, the frequency adjustment offset value is controlled to a positive number, so that the power generation of the ESS (220) increases and the frequency is compensated. Conversely, when the frequency increases, the frequency adjustment offset value is controlled to a negative number, so that energy is stored in the ESS (220) through grid power, so that the frequency can be compensated.

[0046] Through this, ESS systems without FCAS functions can also participate in the FCAS market, and existing FCAS-equipped systems can also operate in the FCAS market by linking with an integrated upper system.

[0047] FIG. 3 is a block diagram schematically illustrating an example of a device for controlling power according to the present disclosure.

[0048] In the following description, any part that overlaps with the description of FIGS. 1 and 2 will be omitted. Referring to FIG. 3, a device (230) for controlling power may include a measuring unit (231), a first communication unit (232), a second communication unit (233), and a processor (234).

[0049] The measuring unit (231) can sense power and current to measure first power information. Here, the first power information can include frequency, active power, reactive power, apparent power, and power factor.

[0050] Frequency can indicate the number of oscillations of an alternating current (AC) electrical signal generated in a power grid. It is typically expressed in Hertz (Hz) and can represent the number of cycles per second. Active power (or real power) can indicate the power actually delivered and used in a power grid. Active power is the power used to perform work or convert energy, and is typically expressed in units of watts (W). Active power can indicate the actual use of electrical energy. Reactive power can indicate the form of power generated during energy conversion and transmission processes in a power network without performing effective work. Apparent power is the sum of active power and reactive power and can indicate the total amount of power delivered in a power network. Power factor can indicate the ratio of active power to apparent power in a power grid. Power factor can typically be expressed as a value between 0 and 1, or 0% to 100%. A power factor of 1 or 100% means the system is fully efficient. A lower power factor reduces efficiency. A low power factor increases reactive power, which can strain the power network and electrical equipment.

[0051] The communication unit can be connected to the VPP operating system (210) and the ESS (220) to transmit and receive information. The communication unit can transmit information to the VPP operating system (210) and the ESS (220) using RS-485 communication, Wi-Fi or Ethernet communication, Modbus protocol communication, TCP / IP or UDP communication, etc. In the present disclosure, the communication unit can include a first communication unit (232) and a second communication unit (233).

[0052] The first communication unit (232) can communicate with the VPP operating system (210). The first communication unit (232) exchanges information for managing VPP Clustering and nameplate information regarding the rated capacity of the actual ESS (220), and can receive a power management activation control command (signal) for frequency adjustment from the VPP operating system (210) when energy trading is required according to the FCAS market.

[0053] The second communication unit (233) can transmit the second power information generated by the processor (234) to the ESS (220).

[0054] The processor (234) can initiate operation by a control signal received from the VPP operating system (210), determine a frequency adjustment offset value according to a frequency included in the first power information measured by the measuring unit (231), calculate second power information based on the frequency adjustment offset value, and control the second communication unit (233) so that the second power information is transmitted to the ESS (220).

[0055] The processor (234) may determine a first frequency adjustment offset value when the frequency is lower than or equal to a first threshold value, and may include a recalculated value of the active power converted into the maximum generation value of the ESS based on the first frequency adjustment offset value in the second power information. Here, the first threshold value may be, for example, 59.7 Hz, but is not limited thereto. In other words, the first threshold value may be set in various ways within a range in which the power control device (230) can operate efficiently.

[0056] In addition, the first frequency adjustment offset value may include a value that processes the rated output of the ESS (220) as a positive number. In addition, the processor (234) may include the current recalculated value calculated based on the active power recalculated value and the voltage sensed by the measuring unit (231) in the second power information.

[0057] The processor (234) may determine a second frequency adjustment offset value when the frequency is equal to or greater than a second threshold value, and may include a recalculated active power value, which is obtained by converting the active power into the maximum charge value of the ESS based on the second frequency adjustment offset value, in the second power information. Here, the second threshold value may be, for example, 60.3 Hz, but is not limited thereto. In other words, the second threshold value may be set in various ways within a range in which the power control device (230) can operate efficiently.

[0058] In addition, the second frequency adjustment offset value may include a value that processes the maximum value that the ESS (220) can charge as a negative number. In addition, the processor (234) may include the current recalculated value calculated based on the active power recalculated value and the voltage sensed by the measuring unit (231) in the second power information.

[0059] The power grid can experience fluctuations in frequency due to power supply and demand disruptions, such as when actual consumption differs from power generation forecasts on the power exchange, or when the growth of renewable energy sources (e.g., PV) that generate power under climatic conditions makes power generation forecasts difficult. For example, in Korea, the grid frequency needs to be adjusted to 60±0.5Hz. ESS (220), which responds faster than conventional generators, can be utilized for this frequency adjustment.

[0060] Frequency changes due to a mismatch between power supply and demand can occur when demand exceeds supply, leading to increased electromotive force (impeding the rotation of the power plant rotor), which can lower the frequency. Furthermore, when supply exceeds demand, electromotive force decreases, which can lead to increased frequency.

[0061] Fluctuations in the power grid frequency can lead to power quality issues, system or product failures and malfunctions, and in severe cases, even large-scale power outages. To maintain system stability, the ESS (220) can generate power when the frequency drops and charge power when the frequency rises, ensuring real-time supply and demand balance.

[0062] Domestic operating standards stipulate that power management for frequency regulation is performed when the grid frequency deviation is 0.03 Hz or more, and that power management for frequency regulation is stopped when the grid frequency deviation is less than 0.03 Hz. Here, a control signal for performing or stopping the frequency regulation function can be transmitted from the VPP operating system (210) to the power control device (230) via the first communication unit (232).

[0063] In this disclosure, a device (230) for controlling power is configured to respond in real time to frequency adjustment, and when a change in frequency is detected, an offset value is adjusted to the existing system current and active power, and then the data is recalculated and provided to the ESS (220) so that control can be performed to respond to actual load and frequency adjustment.

[0064] For example, the processor (234) can generate an effective power recalculation value according to the mathematical expression 2 below.

[0065]

[0066] Additionally, the processor (234) can generate a current recalculation value according to the mathematical expression 3 below.

[0067]

[0068] Referring to mathematical expressions 2 and 3, since the frequency is lower than or equal to the first threshold value (e.g., 59.7 Hz), the processor (234) can determine a first frequency adjustment offset value that processes the rated output of the ESS (220) as a positive number. Accordingly, from the perspective of the ESS (220), maximum power generation is performed, and the remaining power after responding to the load (240) is exported to the grid, thereby generating power.

[0069] Additionally, since the frequency is higher than the second threshold value (e.g., 60.37 Hz), the processor (234) can determine a second frequency adjustment offset value that processes the maximum value that the ESS (220) can charge as a negative number. Accordingly, from the perspective of the ESS (220), it is determined that there is surplus power from another generator, and it can actually import power into the grid to store power.

[0070] FIG. 4 is a flowchart illustrating an example of an operation method of a device for controlling power according to the present disclosure.

[0071] In the following description, any part that overlaps with the description of FIGS. 1 to 3 will be omitted. The method of operating a power control device according to an embodiment of the present disclosure will be described assuming that the power control device (230) performs the operation with the help of peripheral components. As an optional embodiment, the method of controlling power according to an embodiment of the present disclosure may be performed by a processor (234) with the help of peripheral components.

[0072] Referring to FIG. 4, in step S410, a device (230) for controlling power can initiate operation by a control signal received from a VPP operating system (210).

[0073] In step S420, the power control device (230) can calculate second power information based on a frequency adjustment offset value determined according to a frequency included in the first power information. In the present disclosure, the first power information can include frequency, active power, reactive power, apparent power, and power factor measured by sensing power and current.

[0074] In the present disclosure, the power control device (230) determines a first frequency adjustment offset value when the frequency is lower than or equal to a first threshold value, and includes a recalculated active power value, which is obtained by converting active power into a maximum generation value of the energy storage system based on the first frequency adjustment offset value, in the second power information. The power control device (230) can include a recalculated current value calculated based on the recalculated active power value and the voltage sensed by the measuring unit in the second power information.

[0075] In the present disclosure, the power control device (230) may determine a second frequency adjustment offset value when the frequency is equal to or greater than a second threshold value, and may include in the second power information a recalculated active power value, which is obtained by converting the active power into a maximum charge value of the energy storage system based on the second frequency adjustment offset value. The power control device (230) may include in the second power information a recalculated current value, which is calculated based on the recalculated active power value and the voltage sensed by the measuring unit.

[0076] In step S430, the power control device (230) can transmit second power information to the ESS (220).

[0077] FIG. 5 is a flowchart illustrating another example of an operating method of a power control device according to the present disclosure. In the following description, any part that overlaps with the description of FIGS. 1 to 4 will be omitted. The operating method of a power control device according to another embodiment of the present disclosure may be performed by a processor (234) with the help of peripheral components of a power control device (230). As an optional embodiment, the method of power control according to another embodiment of the present disclosure may be performed by a power control device (230) with the help of peripheral components.

[0078] Referring to FIG. 5, in step S510, the processor (234) can determine whether the FCAS mode is activated. The processor (234) can initiate an operation by receiving an FCAS activation control command (signal) from the VPP operating system (210) through the first communication unit (232). The VPP operating system (210) can transmit a power management activation control command (signal) for frequency regulation to a device (230) that controls power when energy trading is required in the FCAS market. The VPP operating system (210) can transmit an FCAS activation control command (signal) to perform a power management function for frequency regulation when the grid frequency deviation is 0.03 Hz or more and to stop the power management function for frequency regulation when the grid frequency deviation is less than 0.03 Hz.

[0079] In step S520, when the FCAS mode is activated, the processor (234) can receive a frequency measurement value included in the first power information from the measurement unit (231).

[0080] In steps S530 and S540, the processor (234) determines a first frequency adjustment offset value when the frequency received from the measuring unit (231) is less than or equal to a first threshold value (e.g., 59.7 Hz), and may include in the second power information an active power recalculation value that converts the active power into the maximum generation value of the ESS based on the first frequency adjustment offset value, and a current recalculation value that is calculated based on the active power recalculation value and the voltage sensed by the measuring unit, and transmit the same to the ESS (220). Here, the first frequency adjustment offset value may include a value that processes the rated output of the ESS (220) as a positive number.

[0081] In steps S550 and S560, the processor (234) determines a second frequency adjustment offset value when the frequency is equal to or greater than a second threshold value (e.g., 60.37 Hz), and may include in the second power information an active power recalculation value that converts the active power into the maximum charge value of the ESS based on the second frequency adjustment offset value, and a current recalculation value that is calculated based on the active power recalculation value and the voltage sensed by the measuring unit, and transmit the same to the ESS (220). Here, the second frequency adjustment offset value may include a value that processes the maximum value that the ESS (220) can charge as a negative number.

[0082] At step S570, the processor (234) may terminate without recalculating the active power if the FCAS mode is disabled, the frequency exceeds the first threshold, or the frequency is below the second threshold.

[0083] According to the present disclosure, when applying the FACS function to the ESS (220), the power generation or charging amount of the ESS (220) can be controlled through the power control device (230) without a separate Energy gateway. A VPP Cluster must be configured in an FCAS unit area, but in an area composed of various manufacturers, the complexity of the VPP service increases when implemented as Cloud-to-Cloud and it is difficult to satisfy the FCAS responsiveness. However, if a VPP Cluster is formed through the power control device (230), the power control device (230) itself can respond to FCAS in real time through a single VPP service, making the integrated configuration easier and increasing the control responsiveness.

[0084] The embodiments of the present disclosure described above may be implemented in the form of a computer program that can be executed through various components on a computer, and such a computer program may be recorded on a computer-readable medium. In this case, the medium may include a magnetic medium such as a hard disk, a floppy disk, and a magnetic tape, an optical recording medium such as a CD-ROM and a DVD, a magneto-optical medium such as a floptical disk, and a hardware device specifically configured to store and execute program instructions, such as a ROM, a RAM, a flash memory, etc.

[0085] Meanwhile, the computer program may be specifically designed and configured for the present disclosure, or may be known and available to those skilled in the computer software field. Examples of computer programs may include not only machine language code, such as that generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

[0086] The use of the term "above" and similar referential terms in the specification of this disclosure (especially in the claims) may refer to both the singular and the plural. Furthermore, if a range is described in this disclosure, it is intended that the disclosure includes individual values ​​within the range (unless otherwise stated), and is equivalent to describing each individual value within the range in the detailed description of the disclosure.

[0087] Unless the steps constituting the method according to the present disclosure are explicitly described in a specific order or are otherwise described in a different order, the steps may be performed in any appropriate order. The present disclosure is not necessarily limited by the order in which the steps are described. The use of all examples or exemplary terms (e.g., "for example," etc.) in this disclosure is merely intended to illustrate the present disclosure in more detail, and the scope of the present disclosure is not limited by the examples or exemplary terms unless otherwise defined by the claims. Furthermore, those skilled in the art will appreciate that various modifications, combinations, and variations can be configured according to design conditions and factors within the scope of the appended claims or their equivalents.

[0088] Therefore, the spirit of the present disclosure should not be limited to the embodiments described above, and all scopes equivalent to or equivalent to the scope of the following claims as well as the scope of the present disclosure are considered to fall within the scope of the spirit of the present disclosure.

Claims

1. A communication unit that is connected to the virtual power plant (VPP) operating system and the energy storage system (ESS) to transmit and receive information; and A power control device, comprising a processor that controls the communication unit to initiate operation by a control signal received from the virtual power plant operation system through the communication unit, calculate second power information based on a frequency adjustment offset value determined according to a frequency included in the first power information, and transmit the second power information to the energy storage system.

2. In paragraph 1, The above first power information is, A device for controlling power, including frequency, real power, reactive power, apparent power and power factor, which are measured by sensing power and current.

3. In paragraph 2, The above processor, As the frequency is lower than or equal to the first threshold value, a first frequency adjustment offset value is determined, and a recalculated value of the active power converted into the maximum power generation value of the energy storage system based on the first frequency adjustment offset value is included in the second power information. A power control device that includes the current recalculation value calculated based on the above-mentioned effective power recalculation value and the voltage sensed by the measuring unit in the second power information.

4. In paragraph 2, The above processor, As the frequency is greater than or equal to the second threshold value, a second frequency adjustment offset value is determined, and the active power recalculated value, which is the active power converted into the maximum charge value of the energy storage system based on the second frequency adjustment offset value, is included in the second power information. A power control device that includes the current recalculation value calculated based on the above-mentioned effective power recalculation value and the voltage sensed by the measuring unit in the second power information.

5. As an operating method of a device controlling power, A step of initiating operation by a control signal received from a virtual power plant (VPP) operating system; A step of calculating second power information based on a frequency adjustment offset value determined according to a frequency included in the first power information; and A method comprising the step of transmitting the second power information to the energy storage system (ESS).

6. In paragraph 5, The above first power information is, A method comprising measuring frequency, real power, reactive power, apparent power and power factor by sensing power and current.

7. In paragraph 6, The step of calculating the second power information is as follows: A step of determining a first frequency adjustment offset value when the frequency is lower than or equal to a first threshold value, and including a recalculated value of the active power converted into the maximum power generation value of the energy storage system based on the first frequency adjustment offset value in the second power information; and Including a step of including the current recalculation value calculated based on the above effective power recalculation value and the voltage sensed by the measuring unit in the second power information. A method of operating a device for controlling power.

8. In paragraph 6, The step of calculating the second power information is as follows: A step of determining a second frequency adjustment offset value when the frequency is greater than or equal to a second threshold value, and including a recalculated value of the active power converted into a maximum charge value of the energy storage system based on the second frequency adjustment offset value in the second power information; and A method comprising the step of including a current recalculation value calculated based on the above-described effective power recalculation value and the voltage sensed by the measuring unit in the second power information.

9. A computer-readable recording medium having recorded thereon a program for executing the method of Article 5 on a computer.

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