Management device for controlling energy storage device and operating method therefor

Abstract

A management device for controlling an energy storage device according to an embodiment disclosed in the present document may comprise: a communication circuit for receiving regional information related to the energy storage device and communication information related to the energy storage device; and a controller for diagnosing a communication state between an inverter and a converter on the basis of the regional information and the communication information.

Description

Management device for controlling energy storage device and its operating method

[0001] Cross-citation with related applications

[0002] This invention claims the benefit of priority from Korean Patent Application No. 10-2023-0112212, filed August 25, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The embodiments disclosed in this document relate to a management device for controlling an energy storage device and a method of operating the same.

[0005] An Energy Storage System (ESS) is a device that temporarily stores electricity generated by power plants and other sources during periods of low demand, then supplies the stored power to the grid during periods of high demand, thereby promoting efficient power use. Recently, interest in residential ESS, which can store power generated by solar power and other sources, has been growing.

[0006] An Energy Storage System (ESS) largely consists of an inverter connected to the grid, a battery for storing power supplied by the grid, and a converter for DC-DC conversion. The converter, which performs DC-DC conversion, is connected to the inverter and exchanges communication signals. However, if the inverter malfunctions, communication between the inverter and the converter may be interrupted. However, in the event of a communication interruption, it is difficult for the converter to distinguish whether the fault is due to a grid power outage or a simple inverter failure. Therefore, it is necessary to diagnose the communication status between the inverter and the converter by comprehensively considering the grid power outage situation.

[0007] One purpose of the embodiments disclosed in this document is to provide a management device and an operating method thereof for diagnosing a communication status between an inverter and a converter in consideration of a power outage situation.

[0008] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0009] According to one embodiment disclosed in this document, a management device for controlling an energy storage system may include a communication circuit for receiving area information related to the energy storage device and communication information related to the energy storage device, and a controller for diagnosing a communication status between an inverter and a converter based on the area information and the communication information.

[0010] In one embodiment, the area information may include information about a ratio of the total amount of power consumed in the area where the energy storage device is located to the total amount of power supplied to the area where the energy storage device is located.

[0011] In one embodiment, the region information may include information regarding the average time required to restore a power outage that occurred in the power grid of the region to which the energy storage device belongs.

[0012] According to one embodiment, the inverter and the converter are connected to each other via a communication line, and the communication information may include information about a communication reference time determined based on the length of the communication line and a period for exchanging communication signals between the inverter and the converter.

[0013] According to one embodiment, the information regarding the communication reference time may have a value that increases in proportion to the length of the communication line or increases in proportion to the period.

[0014] According to one embodiment, if a communication signal is not transmitted from the inverter to the converter through the communication line for a critical period of time, the controller can diagnose the communication status as a LOC (Loss of Communication) status and calculate the critical period of time based on the local information and the communication information.

[0015] According to one embodiment, the controller can calculate the critical time according to the following formula.

[0016] t d =ROUND(logT*x r )

[0017] t d : Critical time

[0018] T: Average time required to restore power outages in an area

[0019] x: communication reference time

[0020] r: Ratio of total power consumption to total power supply for the region

[0021] ROUND(): Rounding function

[0022] According to one embodiment disclosed in this document, a method of operating a management device for controlling an energy storage system may include a step of calculating a critical time based on regional information related to the energy storage device and communication information related to the energy storage device, and a step of diagnosing a communication status between an inverter and a converter based on the critical time.

[0023] In one embodiment, the region information may include information about a ratio of the total amount of power consumed in the region to which the energy storage device belongs to the total amount of power supplied to the region to which the energy storage device belongs.

[0024] In one embodiment, the region information may include information regarding the average time required to restore a power outage that occurred in the power grid of the region to which the energy storage device belongs.

[0025] According to one embodiment, the inverter and the converter are connected to each other via a communication line, and the communication information may include information about a communication reference time determined based on the length of the communication line and a period for exchanging communication signals between the inverter and the converter.

[0026] According to one embodiment, the critical time can be calculated according to the following formula.

[0027] t d =ROUND(logT*x r )

[0028] t d : Critical time

[0029] T: Average time required to restore power outages in an area

[0030] x: communication reference time

[0031] r: Ratio of total power consumption to total power supply for the region

[0032] ROUND(): Rounding function

[0033] According to one embodiment, the step of diagnosing the communication status may include the step of measuring a time during which a communication signal is not received from the inverter to the converter through the communication line for a critical time, and the step of diagnosing the communication status as a LOC (Loss of Communication) state when the time during which the communication signal is not received reaches the critical time.

[0034] A management device according to an embodiment disclosed in this document is provided, which diagnoses a communication status between an inverter and a converter by taking into account local information and communication information, and an operating method thereof.

[0035] FIG. 1 is a drawing for explaining an energy storage system and peripheral configuration according to one embodiment disclosed in this document.

[0036] FIG. 2 is a drawing for explaining a management device and peripheral configuration according to one embodiment disclosed in this document.

[0037] FIG. 3 is a diagram for explaining local information according to one embodiment disclosed in this document.

[0038] FIG. 4 is a drawing for explaining a critical time determined according to one embodiment disclosed in this document.

[0039] FIG. 5 is a flowchart illustrating the operation of a management device according to an embodiment disclosed in this document.

[0040] Hereinafter, embodiments disclosed in this document will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components are given identical reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments disclosed in this document, detailed descriptions of related known structures or functions will be omitted if they are deemed to hinder understanding of the embodiments disclosed in this document.

[0041] In describing the components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components and do not limit the nature, order, or sequence of the components. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0042] FIG. 1 is a drawing for explaining an energy storage system and peripheral configuration according to one embodiment disclosed in this document.

[0043] Referring to FIG. 1, an energy storage system (1000) can be electrically connected to a power generation system (10), a system (20), and a load (30).

[0044] The power generation system (10) may be a system that generates electricity using an energy source. The electricity generated by the power generation system (10) may be supplied to an energy storage system (1000). The power generation system (10) may include a solar power generation system, a wind power generation system, a tidal power generation system, etc., but is not limited to these examples. For example, the power generation system (10) may include a system that generates electricity using renewable energy sources such as solar heat, solar light, and geothermal heat.

[0045] The system (20) may refer to a network connected between power producers and power consumers, including a power plant that produces power, a substation that raises or lowers voltage for transmission / distribution, transmission lines that transmit power, and distribution lines that transmit power to power consumers. When the system (20) operates normally, the system (20) can supply power to the energy storage system (1000). In addition, the system (20) can receive power from the energy storage system (1000).

[0046] According to an embodiment, the energy storage system (1000) may be a grid-connected energy system that uses both power supplied by a power company through a grid (20) and power supplied by a power generation system (10), but is not limited thereto.

[0047] If the system (20) does not operate normally, the power supply from the system (20) to the energy storage system (1000) may be interrupted. In addition, the power supply from the energy storage system (1000) to the system (20) may also be interrupted.

[0048] According to an embodiment, a case in which the system (20) does not operate normally may include a case in which a power outage occurs in the system (20).

[0049] A load (30) may consume power produced by a power generation system (10), power stored in an energy storage system (1000), or power supplied from a grid (20). For example, a load (30) may collectively refer to a consumer who consumes power, such as a factory or a home.

[0050] The energy storage system (1000) may include a power conversion unit (1100) and a battery system (1200).

[0051] The power conversion unit (1100) can appropriately convert power when the energy storage system (1000) provides power to the system (20) or the load (30), or when the power generation system (10) provides power to the energy storage system (1000). The power conversion unit (1100) can include a power conversion system (PCS). For example, the power conversion unit (1100) can convert alternating current (AC) power into direct current (DC) power, or convert direct current (DC) power into alternating current (AC) power.

[0052] The battery system (1200) can store power provided from a power generation system (10) or a grid (20). According to an embodiment, the energy storage system (1000) can provide power stored in the battery system (1200) to the grid (20) or a load (30). The battery system (1200) can include a battery rack, a battery module, a battery pack, etc. capable of storing power.

[0053] FIG. 2 is a drawing for explaining a management device and a peripheral configuration according to an embodiment disclosed in this document, FIG. 3 is a drawing for explaining local information according to an embodiment disclosed in this document, and FIG. 4 is a drawing for explaining a critical time determined according to an embodiment disclosed in this document.

[0054] First, referring to FIG. 2, the management device (1300) can control the overall operation of the energy storage system (1000, see FIG. 1).

[0055] In FIG. 2, the management device (1300) is depicted as a separate device distinct from the power conversion unit (1100) and the battery system (1200), but is not limited thereto, and the management device (1300) may be included in the battery system (1200) or included in the DC-DC converter (1210) to control the energy storage system (1000).

[0056] The management device (1300) may include a controller (1310) that controls a communication line between the inverter (1110) and the DC-DC converter (1210) and a communication circuit (1320) that receives local information related to the energy storage system (1100, see FIG. 1) and communication information related to the energy storage system (1100, see FIG. 1).

[0057] The controller (1310) can diagnose the communication status by comparing the time during which a communication signal is not transmitted from the inverter (1110) to the DC-DC converter (1210) through the communication line with a critical time.

[0058] The communication circuit (1320) may be configured to receive local information and communication information. For example, the communication circuit (1320) may receive local information from an external source, including information on the local power generation-to-consumption ratio or the average time required to restore a local power outage. In an embodiment, the local information may include energy statistics, such as those obtained from surveys conducted by the National Statistical Office or power generation companies.

[0059] According to an embodiment, the communication circuit (1320) may be configured to receive communication information including information about a communication reference time from an external source.

[0060] According to an embodiment, the DC-DC converter (1210) may provide an enable signal to the controller (1310) indicating whether a communication signal transmitted from the inverter (1110) is received. The controller (1310) may diagnose the communication status between the DC-DC converter (1210) and the inverter (1110) based on the logic state of the enable signal. For example, when the enable signal is in a logic high state, the controller (1310) may diagnose that communication is normally performed between the inverter (1110) and the DC-DC converter (1210). However, this is exemplary, and when the enable signal is in a logic low state, the controller (1310) may also diagnose that communication is normally performed between the inverter (1110) and the DC-DC converter (1210).

[0061] According to an embodiment, when the management device (1300) is included inside the DC-DC converter (1210), the controller (1310) can directly measure the time during which no communication signal is transmitted from the inverter (1110) to diagnose the communication status between the DC-DC converter (1210) and the inverter (1110).

[0062] According to an embodiment, if a communication signal is not transmitted from the inverter (1110) to the DC-DC converter (1210) for a critical period of time, the controller (1310) can diagnose the communication status between the inverter (1110) and the DC-DC converter (1210) as a LOC (Loss of Communication) status.

[0063] According to an embodiment, the critical time may be determined based on regional information, which is information related to the region where the energy storage system (1000) is located, and communication information related to the energy storage system (1000). The reason for considering regional information related to the region where the energy storage system (1000) is located is explained with reference to FIG. 3.

[0064] Referring to FIG. 3, energy storage systems located in each of the regions (400, 500, 600) are illustrated.

[0065] According to an embodiment, three energy storage systems (401, 402, 403) and power generation facilities, etc. may be located in region A (400), two energy storage systems (501, 502) and power generation facilities, etc. may be located in region B (500), and one energy storage system (601) and power generation facilities, etc. may be located in region C (600), but this document is not limited to these examples.

[0066] In an embodiment, regional information may include information about the region where the energy storage system is located. In an embodiment, the criteria for defining regions may include, but are not limited to, criteria for dividing the country into administrative districts, such as special cities, metropolitan cities, special self-governing provinces, provinces, cities, counties, and districts.

[0067] Each distinct region (Region A, Region B, Region C) may experience differences in power consumption and power supply depending on factors such as grids, power generation systems, and the presence of industrial facilities. For example, in regions with many industrial facilities or industrial complexes (e.g., Region A), the amount of power supplied and consumed may be higher than in other regions. In contrast, in regions with low population density or densely populated residential areas (e.g., Region C), the amount of power supplied and consumed may be lower than in other regions.

[0068] Additionally, the time required to restore a power outage in a specific region may vary depending on factors such as the number of facilities and population density within each region (Region A, Region B, Region C). For example, in regions with high population density and a high concentration of facilities and energy storage systems (e.g., Region A), the complexity of the power grid system increases, potentially leading to longer power outage restoration times. Therefore, considering these variables when determining region information allows for a more accurate diagnosis of the communication status between the inverter and converter.

[0069] Referring to Fig. 4, the critical time can be determined by considering communication information in addition to local information.

[0070] In an embodiment, the local information may include information about the ratio of power generation to consumption and information about the average time it takes to restore a power outage that occurred in the local area.

[0071] The controller (1310, see FIG. 2) can determine the critical time based on regional information including the regional power production-to-consumption ratio and the time required to restore a power outage that occurred in the region.

[0072] In an embodiment, the regional power generation-to-consumption ratio may include information regarding the ratio calculated by dividing the power consumption in a specific region by the power supply supplied to the region. For example, assuming that regions are administratively divided into "cities," the regional power generation-to-consumption ratio may include information regarding the ratio calculated by dividing the total power consumption in each "city" by the total power supply supplied to the "city." In an embodiment, the regional power generation-to-consumption ratio may be calculated based on energy-related statistical data, etc.

[0073] The time required to restore a power outage in a region may include information on the average time required to restore a power outage in the region. For example, assuming that regions are administratively divided into "cities," the time required to restore a power outage in the region may include information on the average time, which is the average time required to restore a power outage in each "city." In an embodiment, information on the average time required to restore a power outage may be calculated based on energy-related statistical data, etc.

[0074] The management device that manages the energy storage systems (401, 402, 403, 501, 502, 601) located in each of the regions (400, 500, 600) can determine a critical time for diagnosing the communication status between the inverter and the converter by considering the region information as above.

[0075] According to an embodiment, a controller (1310, see FIG. 1) of a management device managing an energy storage system (ex. 401) located in region A (400) may consider the power production-to-consumption ratio of region A (400) and the average time required to restore a power outage that occurred in region A (400), a controller (1310) of a management device managing an energy storage system (ex. 501) located in region B (500) may consider the power production-to-consumption ratio of region B (500) and the average time required to restore a power outage that occurred in region B (500), and a controller (1310) of a management device managing an energy storage system (ex. 601) located in region C (600) may consider the power production-to-consumption ratio of region C (600) and the average time required to restore a power outage that occurred in region C (600).

[0076] Hereinafter, an example will be described in which a controller (1310) of a management device (1300) linked to an energy storage system (401) located in region A (400) determines a critical time, but the following description can be substantially equally applied to a controller (1310) of a management device (1300) linked to other energy storage systems (402, 403, 501, 502, 601).

[0077] The controller (1310, see FIG. 2) can determine a threshold time based on communication information including information about a communication reference time.

[0078] According to an embodiment, the communication information may include information regarding a communication reference time.

[0079] According to an embodiment, the communication reference time may be a theoretical critical time for diagnosing the communication status between an inverter (1110, see FIG. 2) and a DC-DC converter (1210, see FIG. 2) that are connected to each other through a communication line.

[0080] According to an embodiment, the communication reference time may vary based on the length of the communication line (see FIG. 2) connected between the inverter (1110) and the DC-DC converter (1210). Additionally, the communication reference time may vary based on the cycle of exchanging communication signals between the inverter (1110) and the DC-DC converter (1210).

[0081] For example, if the length of the communication line between the inverter (1110) and the DC-DC converter (1210) is relatively long, it may take a long time to exchange communication signals between the inverter (1110) and the DC-DC converter (1210). Therefore, if the communication reference time is excessively short, there is a high possibility that a misdiagnosis that a problem has occurred in the communication status between the inverter (1110) and the DC-DC converter (1210) even though there is no communication interruption occurs. This also applies if the cycle for exchanging communication signals between the inverter (1110) and the DC-DC converter (1210) is relatively long.

[0082] According to an embodiment, the communication reference time may increase in proportion to the length of the communication line between the inverter (1110) and the DC-DC converter (1210), and the communication reference time may increase in proportion to the cycle of exchanging communication signals between the inverter (1110) and the DC-DC converter (1210).

[0083] The critical time may be a reference time for diagnosing the communication status between the inverter (1110) and the DC-DC converter (1210) illustrated in FIG. 2. According to an embodiment, if communication between the inverter (1110) and the DC-DC converter (1210) does not occur for the critical time, the controller (1310) may diagnose the communication status between the inverter (1110) and the DC-DC converter (1210) as a LOC (Loss of Communication) status.

[0084] The controller (1310) can control power to be supplied from the DC-DC converter (1210) to the inverter (1110) when the communication state between the inverter (1110) and the DC-DC converter (1210) is in the LOC state.

[0085] According to an embodiment, the controller (1310) may control the battery system (1200) to supply power stored in the battery system (1200) to the inverter (1110). Energy stored in a battery rack, battery pack, or battery module included in the battery system (1200) may be supplied from the DC-DC converter (1210) to the inverter (1110) via a power transmission line (see FIG. 2).

[0086] The controller (1310, see FIG. 2) can calculate a critical time based on local information and communication information. According to an embodiment, the controller (1310) can calculate the critical time according to the following mathematical formula, taking into account local information and communication information.

[0087] [Mathematical Formula 1]

[0088] t d =ROUND(logT*x r )

[0089] t d : Critical time

[0090] T: Average time required to restore power outages in an area

[0091] x: communication reference time

[0092] r: Ratio of total power consumption to total power supply for the region

[0093] ROUND(): Rounding function

[0094]

[0095] According to an embodiment, when the power statistics of region A (400) are as follows, the controller (1310) can calculate the critical time for diagnosing the LOC status between the inverter (1110) and the DC-DC converter (1210) as follows.

[0096] According to an example, if the power supply of region A (400) is 122 GWh and the power consumption of region A (400) is 130 GWh, the controller (1310) can calculate the power production-to-consumption ratio of region A (400) as r = 130 (Gwh) / 122 (Gwh) = 1.06.

[0097] According to an example, the average time required to restore a power outage that occurred in area A (400) may be 600 seconds (s).

[0098] According to an embodiment, the communication reference time determined according to the length of the communication line and the communication signal exchange cycle between the inverter (1110) and the DC-DC converter (1210) of the energy storage system (1000) located in region A (400) may be 10 seconds (s).

[0099] According to an embodiment, the controller (1310) sets the threshold time for diagnosing the LOC status to ROUND(log600*10 1.06 )=32s can be calculated. Here, the ROUND() function can be a function that rounds the value in the parentheses.

[0100] According to an embodiment, if a communication signal is not transmitted from an inverter (1110) of an energy storage system (1000) included in region A (400) to a DC-DC converter (1210) for 32 seconds, the controller (1310) can diagnose the communication status between the inverter (1110) and the DC-DC converter (1210) as a LOC status. That is, if a communication signal is not transmitted from the inverter (1110) to the DC-DC converter (1210) for 32 seconds, the controller (1310) can supply energy stored in the battery system (1200, see FIG. 1) to the inverter (1110) through a power transmission line.

[0101] When the controller (1310) diagnoses the communication status between the inverter (1110) and the DC-DC converter (1210), it is generally not taken into consideration whether the system (20, see FIG. 1) is in a power outage state. However, cases in which communication between the inverter (1110) and the DC-DC converter (1210) is cut off may include cases in which the inverter (1110) is blacked out due to a power outage occurring in the system (20), thereby cutting off communication between the inverter (1110) and the DC-DC converter (1210), and cases in which communication between the inverter (1110) and the DC-DC converter (1210) is cut off due to an abnormality or failure occurring in the inverter (1110) or the DC-DC converter (1210) even though a power outage did not occur in the system (20). Among them, if a power outage does not occur in the system (20) but communication is cut off between the inverter (1110) and the DC-DC converter (1210), unnecessary operations may be involved, such as when the controller (1310) supplies power to the inverter (1110) even though power supply to the inverter (1110) is not required.

[0102] Accordingly, according to one embodiment disclosed in this document, the controller (1310) can consider a power outage state of the system (20) when diagnosing a communication state between the inverter (1110) and the DC-DC converter (1210). In addition, information regarding the area where the energy storage system (1000) is located can be further considered, thereby reducing misdiagnosis regarding a communication outage occurring between the inverter (1110) and the DC-DC converter (1210).

[0103] FIG. 5 is a flowchart for explaining the operation of a management device (1300, see FIG. 2) according to one embodiment disclosed in this document.

[0104] Referring to FIG. 5, in step S501, the management device (1300) can calculate a critical time based on regional information related to the energy storage device (1000, see FIG. 1) and communication information related to the energy storage device.

[0105] According to an embodiment, the critical time may be a reference time for diagnosing a communication status between an inverter (1110, see FIG. 2) and a DC-DC converter (1210, see FIG. 2) included in an energy storage device (1000). For example, if a communication signal is not transmitted from the inverter (1110) to the DC-DC converter (1210) during the critical time, the management device (1300) may diagnose the communication status between the inverter (1110) and the DC-DC converter (1210) as a LOC (Loss of Communication) status.

[0106] In an embodiment, the area information may include information about the ratio of electricity generation to consumption in the area and information about the average time it takes to restore a power outage that occurred in the area.

[0107] In step S503, the management device (1300) can measure the time during which the communication signal is not received when the communication signal is not transmitted from the inverter (1110) to the DC-DC converter (1210).

[0108] In step S505, the management device (1300) can diagnose the communication status between the inverter (1110) and the DC-DC converter (1210) as a LOC (Loss of Communication) status if the time during which the communication signal is not transmitted from the inverter (1110) to the DC-DC converter (1210) reaches a critical time (Y) (S507). If the time during which the communication signal is not received does not reach the critical time (N), the management device (1300) can again monitor the time during which the communication signal is not transmitted from the inverter (1110) to the DC-DC converter (1210).

[0109] In the above, all components constituting the embodiments have been described as being combined or operating in combination as one. However, this is not necessarily limited to such embodiments, and within the scope of the purpose, all components may be selectively combined and operated in one or more combinations. Furthermore, terms such as "include," "comprise," or "have" described above, unless specifically stated to the contrary, imply that the corresponding component may be inherent, and therefore should be interpreted to include other components rather than excluding other components.

[0110] The above description is merely an example of the technical idea disclosed in this document, and those skilled in the art to which the embodiments disclosed in this document pertain may make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document.

[0111] Accordingly, the embodiments disclosed in this document are intended to illustrate, rather than limit, the technical concepts disclosed in this document, and the scope of the technical concepts disclosed in this document is not limited by these embodiments. The scope of protection of the technical concepts disclosed in this document should be interpreted by the claims below, and all technical concepts within the equivalent scope should be interpreted as being included within the scope of the rights of this document.

[0112] [Explanation of symbols]

[0113] 10: Power generation system 20: Grid

[0114] 30: Load 1000: Energy storage system

[0115] 1100: Power conversion unit 1110: Inverter

[0116] 1200: Battery system 1210: DC-DC converter

[0117] 1300: Management device 1310: Controller

[0118] 1320: Communication circuit

Claims

1. In a management device that controls an energy storage device, A communication circuit for receiving area information related to the energy storage device and communication information related to the energy storage device; and A management device including a controller that diagnoses the communication status between an inverter and a converter based on the above-mentioned regional information and the above-mentioned communication information.

2. In paragraph 1, the regional information is: A management device including information about the ratio of the total amount of electricity consumed in the area where the energy storage device is located to the total amount of electricity supplied to the area where the energy storage device is located.

3. In paragraph 1, the regional information is: A management device that includes information on the average time required to restore a power outage that occurred in the power grid of the region to which the energy storage device belongs.

4. In paragraph 1, The above inverter and the above converter are connected to each other through a communication line, The above communication information is, A management device including information about a communication reference time determined based on the length of the communication line and the period for exchanging communication signals between the inverter and the converter.

5. In paragraph 4, information about the communication reference time is: increases in proportion to the length of the above communication line, or A management device having a value that increases proportionally to the above cycle.

6. In the first paragraph, the controller, If a communication signal is not transmitted from the inverter to the converter through the communication line for a critical period of time, the communication status is diagnosed as LOC (Loss of Communication) status, A management device that calculates the critical time based on the above-mentioned regional information and the above-mentioned communication information.

7. In the 6th paragraph, the controller A management device that calculates the above critical time according to the following formula. t d =ROUND(logT*x r ) t d : Critical time T: Average time required to restore power outages in an area x: communication reference time r: Ratio of total power consumption to total power supply for the region ROUND(): Rounding function 8. In the operating method of a management device that controls an energy storage device, A step of calculating a critical time based on regional information related to the energy storage device and communication information related to the energy storage device; and An operating method of a management device, comprising: a step of diagnosing a communication status between an inverter and a converter based on the above critical time; 9. In paragraph 8, the regional information is: A method of operating a management device including information on the ratio of the total amount of electricity consumed in the area to which the energy storage device belongs to the total amount of electricity supplied to the area to which the energy storage device belongs.

10. In paragraph 8, the regional information is: A method of operating a management device including information on the average time required to restore a power outage that occurred in a power grid in an area to which the energy storage device belongs.

11. In paragraph 8, The above inverter and the above converter are connected to each other through a communication line, The above communication information is, An operating method of a management device including information regarding a communication reference time determined based on the length of the communication line and the period for exchanging communication signals between the inverter and the converter.

12. In the 8th paragraph, the operating method of the management device is calculated according to the following formula. t d =ROUND(logT*x r ) t d : Critical time T: Average time required to restore power outages in an area x: communication reference time r: Ratio of total power consumption to total power supply for the region ROUND(): Rounding function 13. In the 11th paragraph, the step of diagnosing the communication status is: A step of measuring the time during which no communication signal is received from the inverter to the converter through the communication line for a critical time; and An operating method of a management device, comprising: a step of diagnosing the communication status as a LOC (Loss of Communication) status when the time for which the communication signal is not received reaches the threshold time;

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