Method for controlling charging and discharging of energy storage device in response to peak power detection and apparatus therefor

Abstract

Disclosed are a method for controlling charging and discharging of an energy storage device in response to peak power detection, and an apparatus therefor. According to various embodiments of the present invention, by applying a method for controlling charging and discharging of an energy storage device in response to peak power detection and an apparatus therefor, it is possible to reduce the burden on a power grid by efficiently managing power through the energy storage device at a peak power time period, and to adjust power usage by storing power using the energy storage device and discharging same at peak time.

Description

Method for controlling charging and discharging of an energy storage device in response to peak power detection and device therefor

[0001] The present invention relates to a method for controlling the charging and discharging of an energy storage device in response to peak power detection, and a device therefor. The research of the present invention is related to the "Development of Modular Power Quality Control Technology for Large-Capacity Wind Power (No. 20203030020200)" project, a core technology development (R&D) project for new and renewable energy, supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) with funding from the Ministry of Trade, Industry and Energy.

[0002] The content described in this section merely provides background information for the present embodiment and does not constitute prior art.

[0003] ESS is a device that stores surplus electricity or supplies electricity produced using renewable energy when needed. It stores idle electricity during times of low demand and supplies it during times of high demand, allowing for stable use of electricity.

[0004] This ESS is a core technology essential for building renewable energy systems and smart grids that have recently emerged. Instead of directly transmitting electricity produced at power plants to homes or factories, it stores energy in energy storage devices such as large secondary batteries, and then generates and transmits electricity when and where it is most needed, thereby increasing energy efficiency.

[0005] Typically, ESS batteries can increase energy efficiency by storing electricity and supplying charged electricity when needed. This requires predicting electricity demand and accurately establishing an efficient battery charging and discharging schedule accordingly.

[0006] Since the peak of electricity is an important factor in calculating electricity rates, it is necessary to research and develop a technology that can accurately predict the occurrence of peaks in the electricity provided from the power grid among the electricity used by the power supply device and charge or discharge the ESS that provides electricity to the power supply device based on the occurrence of peaks.

[0007] (Patent Document 0001) Republic of Korea Patent Publication No. 10-2538113 (May 24, 2023)

[0008] The purpose of the present invention is to provide a method and a device therefor for controlling charging and discharging of an energy storage device in response to peak power detection, which can reduce the burden on the power grid by efficiently managing power through an energy storage device during peak power hours, and can control power usage by storing power using the energy storage device and discharging it during peak hours.

[0009] Additional, unspecified, purposes of the present invention can be additionally considered within the scope that can be easily inferred from the detailed description and effects thereof below.

[0010] In order to achieve the above-described object, according to one embodiment of the present invention, a charge / discharge control device for an energy storage device corresponding to peak power includes: a memory storing one or more programs for detecting peak power and controlling charging or discharging of an energy storage device; and one or more processors performing operations according to the one or more programs; wherein the operations performed by the processor may include: a step of determining whether an amount of power flowing in from a power system corresponds to a peak state based on a peak state determination function using a predetermined peak power amount as a variable; and a step of controlling the energy storage device to be discharged in response to a discharge amount calculated through a discharge amount calculation function using the amount of power flowing in from the power system as a variable in the case where the amount of power flowing in from the power system corresponds to a peak state.

[0011] The step of determining whether the above peak state corresponds to the above peak state is characterized in that, if the amount of power flowing in from the power system after the preset cycle starts is greater than the peak state determination function, the peak state is determined to be the above peak state.

[0012] The above peak state judgment function is characterized in that it uses at least one of the predetermined peak power amount, the preset period, or the time elapsed since the preset period started as a variable.

[0013] The above peak state judgment function is characterized in that it is the sum of a first value obtained by multiplying the value obtained by dividing the predetermined peak power amount by the predetermined cycle by the time elapsed since the predetermined cycle started, and a second value obtained by multiplying the predetermined peak power amount by an adjustment value less than 1.

[0014] The above discharge amount calculation function uses the amount of power flowing in from the power system and the discharge amount calculation support function as variables, and the discharge amount calculation support function is characterized in that it uses the predetermined peak power amount or the preset cycle as a variable.

[0015] The above discharge amount calculation function is characterized in that the function value is set to a size equal to the size of the rated voltage of the energy storage device when a predetermined second time has elapsed within the preset period and the amount of power flowing in from the power system is greater than the predetermined peak power amount.

[0016] The above peak state judgment function is characterized in that, when the size of the peak state judgment function is greater than the predetermined peak power amount, the function value is limited to a size equal to the size corresponding to the predetermined peak power amount.

[0017] The processor is characterized in that it controls the energy storage device to stop discharging whenever the preset cycle ends.

[0018] The processor is characterized in that it measures the amount of power flowing in from the power system for a first predetermined time within the preset period, and determines whether the peak state corresponds after the first predetermined time has elapsed.

[0019] The above emission calculation function is characterized in that it has a value smaller than the size of the rated voltage of the energy storage device.

[0020] The above emission calculation function is characterized in that it has a value smaller than a value obtained by subtracting the supply power provided by a renewable energy power generation device that supplies power to the energy storage device from the charging power used by an external device that receives power from the energy storage device.

[0021] The above emission calculation function is characterized by having a value greater than 0.

[0022] In order to achieve the above-described object, a method for controlling charging and discharging of an energy storage device in response to peak power, which is performed in a device including a memory storing one or more programs for detecting peak power and controlling charging or discharging of an energy storage device, and one or more processors performing operations according to the one or more programs, according to one embodiment of the present invention, may include a step of determining whether an amount of power flowing in from a power system corresponds to a peak state based on a peak state determination function using a predetermined peak power amount as a variable; and a step of controlling the energy storage device to be discharged in response to a discharge amount calculated through a discharge amount calculation function using the amount of power flowing in from the power system as a variable, in the case where the amount of power flowing in from the power system corresponds to a peak state.

[0023] The step of determining whether the above peak state corresponds to the above peak state is characterized in that, if the amount of power flowing in from the power system after the preset cycle starts is greater than the peak state determination function, the peak state is determined to be the above peak state.

[0024] The above peak state judgment function is characterized in that it uses at least one of the predetermined peak power amount, the preset period, or the time elapsed since the preset period started as a variable.

[0025] The above peak state judgment function is characterized in that it is the sum of a first value obtained by multiplying the value obtained by dividing the predetermined peak power amount by the predetermined cycle by the time elapsed since the predetermined cycle started, and a second value obtained by multiplying the predetermined peak power amount by an adjustment value less than 1.

[0026] The above discharge amount calculation function uses the amount of power flowing in from the power system and the discharge amount calculation support function as variables, and the discharge amount calculation support function is characterized in that it uses the predetermined peak power amount or the preset cycle as a variable.

[0027] The above discharge amount calculation function is characterized in that the function value is set to a size equal to the size of the rated voltage of the energy storage device when a predetermined second time has elapsed within the preset period and the amount of power flowing in from the power system is greater than the predetermined peak power amount.

[0028] The above peak state judgment function is characterized in that, when the size of the peak state judgment function is greater than the predetermined peak power amount, the function value is limited to a size equal to the size corresponding to the predetermined peak power amount.

[0029] The step of controlling the energy storage device to discharge is characterized in that the energy storage device is controlled to stop discharging whenever the preset cycle ends.

[0030] The step of determining whether the above peak state corresponds to the above is characterized by measuring the amount of power flowing in from the power system for a predetermined first time within the preset period, and determining whether the above peak state corresponds to the above peak state after the predetermined first time has elapsed.

[0031] The above emission calculation function is characterized in that it has a value smaller than the size of the rated voltage of the energy storage device.

[0032] The above emission calculation function is characterized in that it has a value smaller than a value obtained by subtracting the supply power provided by a renewable energy power generation device that supplies power to the energy storage device from the charging power used by an external device that receives power from the energy storage device.

[0033] According to one embodiment of the present invention for achieving the above-described purpose, a computer program is stored in a computer-readable recording medium and causes a computer to execute any one of the charging / discharging control methods of an energy storage device corresponding to the above-described peak power.

[0034] According to one embodiment of the present invention for achieving the above-described object, a power supply system based on renewable energy may include: a renewable energy power generation device that generates power using wind power or solar power; an energy storage device that stores power provided from the renewable energy power generation device; a power system that supplies power; and a charge / discharge control device of the energy storage device corresponding to peak power, which determines whether the amount of power flowing in from the power system corresponds to a peak state based on a peak state determination function that uses a predetermined peak power amount as a variable, and, if it corresponds to the peak state, controls the energy storage device to discharge in response to a discharge amount calculated through a discharge amount calculation function that uses the amount of power flowing in from the power system as a variable.

[0035] As described above, according to one embodiment of the present invention, by applying a method for controlling charging and discharging of an energy storage device in response to peak power detection and a device therefor, it is possible to efficiently manage power through an energy storage device during peak power hours, thereby reducing a burden on the power grid, and to control power usage by storing power using an energy storage device and discharging it during peak hours.

[0036] In addition, according to one embodiment of the present invention, by applying a method and a device therefor for controlling charging and discharging of an energy storage device in response to peak power detection, it is possible to reduce the power bill charged from a power supplier by reducing peak power usage, and to reduce additional costs by controlling power usage by utilizing the energy storage device.

[0037] Even if the effect is not explicitly mentioned herein, the effect and its provisional effect described in the following specification expected by the technical features of the present invention are treated as described in the specification of the present invention.

[0038] FIG. 1 is a drawing for explaining the configuration of a renewable energy-based power supply system according to one embodiment of the present invention.

[0039] FIG. 2 is a drawing for explaining the configuration of a charge / discharge control device of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0040] FIG. 3 is a flowchart for explaining a charging / discharging control method of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0041] FIG. 4 is a drawing for explaining a power supply device of a renewable energy-based power supply system according to one embodiment of the present invention and an external device that receives power from the power supply device.

[0042] FIG. 5 is a drawing for explaining an eco-friendly energy generation device and a configuration of an eco-friendly energy generation device of a renewable energy-based power supply system according to one embodiment of the present invention.

[0043] FIG. 6 is a graph showing a peak state judgment function and a discharge amount calculation support function used in a charging / discharging control device and method of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0044] FIGS. 7 to 9 are diagrams exemplarily showing time-to-power graphs according to the operation of a charging / discharging control device and method of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0045] FIG. 10 is a diagram illustrating an operation algorithm of a charge / discharge control method of an energy storage device corresponding to peak power according to one embodiment of the present invention in the form of code.

[0046] FIG. 11 is a drawing for explaining the configuration of a charge / discharge control device of an energy storage device corresponding to peak power according to another embodiment of the present invention.

[0047] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the present invention of the scope of the invention, and the present invention is defined only by the scope of the claims. Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in a meaning that can be commonly understood by those skilled in the art of the present invention. In addition, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined.

[0048] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms “have,” “may have,” “include,” or “may include” specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Terms including ordinal numbers such as second, first, etc. may be used to describe various components, but the components are not limited by the terms.

[0049] The above terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a second component could be referred to as a first component, and similarly, a first component could also be referred to as a second component. The term "and / or" includes any combination of multiple related items described herein or any one of multiple related items described herein.

[0050] In this specification, the identification numbers (e.g., a, b, c, etc.) for each step are used for convenience of explanation and do not describe the order of each step. Each step may occur in a different order than specified unless the context clearly indicates a specific order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

[0051] In addition, the term '~ unit' described in this specification may mean software or hardware components such as FPGA (field-programmable gate array) or ASIC, and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to play one or more processors. Thus, as an example, the '~ unit' may include components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data structures, and variables. The functionality provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'.

[0052] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the present invention of the scope of the invention, and the present invention is defined only by the scope of the claims. Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in a meaning that can be commonly understood by those skilled in the art of the present invention. In addition, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined.

[0053] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms “have,” “may have,” “include,” or “may include” specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Terms including ordinal numbers such as second, first, etc. may be used to describe various components, but the components are not limited by the terms.

[0054] The above terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a second component could be referred to as a first component, and similarly, a first component could also be referred to as a second component. The term "and / or" includes any combination of multiple related items described herein or any one of multiple related items described herein.

[0055] In this specification, the identification numbers (e.g., a, b, c, etc.) for each step are used for convenience of explanation and do not describe the order of each step. Each step may occur in a different order than specified unless the context clearly indicates a specific order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

[0056] In addition, the term '~ unit' described in this specification may mean software or hardware components such as FPGA (field-programmable gate array) or ASIC, and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to play one or more processors. Thus, as an example, the '~ unit' may include components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data structures, and variables. The functionality provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'.

[0057] Hereinafter, with reference to the attached drawings, various embodiments of a method for controlling charging and discharging of an energy storage device in response to peak power detection according to the present invention and a device therefor (hereinafter referred to as a method and device for controlling charging and discharging of an energy storage device in response to peak power) will be described in detail.

[0058] FIG. 1 is a drawing for explaining the configuration of a renewable energy-based power supply system according to one embodiment of the present invention.

[0059] A renewable energy-based power supply system (10) may include a charge / discharge control device (100) of an energy storage device corresponding to peak power, a power system (200), a power supply device (300), an energy storage device (400), a renewable energy power generation device (500), and a renewable energy-based power supply system management device (hereinafter, referred to as a power supply system management device) (600).

[0060] A charge / discharge control device (100) of an energy storage device corresponding to peak power determines whether the amount of power flowing in from the power system corresponds to a peak state based on a peak state determination function that uses a predetermined peak power amount as a variable, and if it corresponds to a peak state, controls the energy storage device to discharge in response to the discharge amount calculated through a discharge amount calculation function that uses the amount of power flowing in from the power system as a variable.

[0061] Here, the predetermined peak power amount may refer to the maximum allowable power demand. For example, the predetermined peak power amount may be determined based on a time period when power demand generally increases, or a time period when operating power in a work environment or factory increases. In the present invention, it may be determined based on a time period when charging demand for external devices increases. The predetermined peak power amount may be set based on historical data, expected demand, infrastructure capacity, and other factors. In the present invention, the predetermined peak power amount may be determined using methods such as moving averages, time series analysis, machine learning, or real-time monitoring.

[0062] The charge / discharge control device (100) of the energy storage device corresponding to peak power is described in more detail with reference to FIGS. 2, 3, 6 to 11.

[0063] A power system (200) can supply power to a power supply unit (300). The power system (200) can refer to the entire infrastructure that transmits electrical energy from a power plant to end users. For example, the power system can include power plants, voltage step-up and step-down transformers, and transmission and distribution networks used to transmit power to end users. Power users that receive power from the power system (200) can be homes, offices, factories, etc.

[0064] Information on the rates paid for electricity supplied from the power grid can be divided into rates based on electricity demand, rates for the light-load period, rates for the heavy-load period where higher rates are applied than for the light-load period, and rates for the peak-load period where higher rates are applied than for the heavy-load period.

[0065] The power supply device (300) can receive power from at least one of a power system (200), an energy storage device (400), or a renewable energy generation device (500) and supply power to an external device.

[0066] The power supply unit (300) and external devices are described in more detail with reference to FIG. 4.

[0067] The energy storage device (400) can store power provided from a renewable energy generation device (500). The energy storage device (400) can also store power provided from a power system (200). The energy storage device (400) can temporarily store power and provide it for use when needed. The energy storage device (400) can supply power to the power supply device (300) in response to power shortages, power overloads, or peak power demand situations.

[0068] The energy storage device (400) may be an Energy Storage System (ESS). The ESS may include components necessary for storing and supplying energy (e.g., management and control software, safety devices, connection devices, etc.).

[0069] A renewable energy generation device (500) may be a device that generates electricity using sustainable resources. For example, the renewable energy generation device (500) may generate electricity using wind or solar power.

[0070] The renewable energy power generation device (500) is described in more detail with reference to FIG. 5.

[0071] The power system (200), energy storage device (400), or renewable energy generation device (500) can be operated by being connected to an MCCB (Molded Case Circuit Breaker) or a VCB (Vacuum Circuit Breaker), respectively.

[0072] The power supply system management device (600) can check whether a reverse current has occurred in which power is supplied from an energy storage device (400) or a renewable energy generation device (500) to a power system (200), detect the power usage of the power supply device (300), and control the operation of at least one of the energy storage device (400) or the renewable energy generation device (500) based on a group of operation control variables including the occurrence of a reverse current or the power usage.

[0073] In the present invention, reverse current may mean that power is not supplied from the power system (200) to the power supply device (300) or the energy storage device (400), but rather that power is supplied from the energy storage device (400) or the renewable energy generation device (500) to the power system (200).

[0074] The power supply system management device (600) can determine whether a preset period of time is required for the power supply device to preferentially use power supplied from the power grid over power supplied from a renewable energy generation device.

[0075] The action control variable group may further include information on whether the action controlling step is performed within a preset period of time.

[0076] The group of motion control variables may further include information about whether the external device is in a charging state, receiving power from the power supply.

[0077] The power supply system management device (600) can turn off the operation of the renewable energy generation device, regardless of whether the external device is in a charging state receiving power from the power supply device, when the operation controlling step is performed within a preset period of time in the operation controlling step.

[0078] The power supply system management device (600) can determine whether a peak has occurred by comparing the power usage of the power supply device with a preset reference power at the step of detecting the power usage of the power supply device.

[0079] The group of motion control variables may further include whether a peak occurs or not.

[0080] The power supply system management device (600) can turn off charging of the energy storage device when a peak occurs in the step of controlling the operation, regardless of whether the step of controlling the operation is performed within a preset period or whether the external device is in a charging state receiving power from the power supply device.

[0081] The power supply system management device (600) can turn off the energy storage device from performing discharge or turn off the operation of the renewable energy generation device, regardless of whether a reverse current occurs, whether a peak occurs, whether the operation control step is performed within a preset period, or whether the external device is in a charging state receiving power from the power supply device, in the step of controlling the operation.

[0082] The group of operation control variables may include at least one of information about whether the renewable energy generation device is operating, a comparison result between the amount of power used by an external device to charge using the power supply and the amount of power produced by the renewable energy generation device, the State of Charge (SOC) of the energy storage device, a preset target SOC of the energy storage device, a preset maximum SOC of the energy storage device, a preset minimum SOC of the energy storage device, whether the operation control step is performed on a weekday, or a rate paid for power supplied from the power grid.

[0083] Here, the preset period may refer to a period concluded by a contract between a power user (the power supply system or power supply system management device operator in the present invention) and a supplier (the power system operator). The contract between the power user and the power supplier may include information on the preset period, application date, application time, contract capacity, power usage, or peak power. Here, the contract may be a DR (Demand Response) contract.

[0084] The maximum SOC of an energy storage device can be set to ensure safe battery operation, prevent overcharging, and extend battery life. The maximum SOC of an energy storage device can be determined within the range of 80-90% of the maximum charge that can be stored in the battery, but is not necessarily limited to this range. It can also be set differently, taking into account factors such as energy usage and peak power demand.

[0085] The minimum SOC of an energy storage device can be set to prevent battery overdischarge, prevent performance degradation, and ensure safe operation. The minimum SOC of an energy storage device can be determined within the range of 20-30% of the maximum charge that can be stored in the battery, but is not necessarily limited to this range. It can also be set differently, taking into account factors such as energy usage and peak power demand.

[0086] The target SOC of an energy storage device can be set based on the system's operational objectives. For example, if the energy storage device is to supply power during peak hours, the target SOC may be to charge the energy storage device to its maximum SOC. Furthermore, the target SOC may vary depending on factors such as maintaining reserve capacity or meeting specific power demand requirements. The target SOC may also vary depending on factors such as the day of the week, season, time of day, weather, power demand forecast, and whether the load falls within a light, medium, or peak load rate bracket.

[0087] Not all of the components illustrated in FIG. 1 are essential components of the renewable energy-based power supply system (10), and in other embodiments, some components connected to the renewable energy-based power supply system (10) may be added, changed, or deleted.

[0088] FIG. 2 is a drawing for explaining the configuration of a charge / discharge control device of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0089] A charge / discharge control device (100) of an energy storage device corresponding to peak power includes at least one processor (110), a computer-readable storage medium (120), a communication bus (150), and an artificial intelligence-based processing unit (160).

[0090] The processor (110) can be controlled to operate as a charge / discharge control device (100) of an energy storage device corresponding to peak power. For example, the processor (110) can execute one or more programs (121) stored in a computer-readable storage medium (120). The one or more programs (121) can include one or more computer-executable instructions, and the computer-executable instructions, when executed by the processor (110), can be configured to cause the charge / discharge control device (100) of an energy storage device corresponding to peak power to perform operations according to an exemplary embodiment.

[0091] A computer-readable storage medium (120) is configured to store computer-executable instructions or program code, program data, and / or other suitable forms of information. The computer-executable instructions or program code, program data, and / or other suitable forms of information may also be provided via an input / output interface (130) or a communication interface (140). A program (140) stored in the computer-readable storage medium (120) includes a set of instructions executable by the processor (110). In one embodiment, the computer-readable storage medium (120) may be a memory (volatile memory such as random access memory, non-volatile memory, or a suitable combination thereof), one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or any other form of storage medium that is accessible by the charge / discharge control device (100) of the energy storage device corresponding to peak power and capable of storing desired information, or a suitable combination thereof.

[0092] A communication bus (150) interconnects various other components of the energy storage device's charge / discharge control device (100) corresponding to peak power, including a processor (110) and a computer-readable storage medium (120).

[0093] The charge / discharge control device (100) of the energy storage device corresponding to peak power may also include one or more input / output interfaces (130) and one or more communication interfaces (140) that provide interfaces for one or more input / output devices. The input / output interfaces (130) and the communication interfaces (140) are connected to a communication bus (150). The input / output devices (not shown) may be connected to other components of the charge / discharge control device (100) of the energy storage device corresponding to peak power via the input / output interfaces (130).

[0094] The artificial intelligence-based processing unit (160) may perform operations necessary for a charging / discharging control method of an energy storage device corresponding to peak power in conjunction with the processor (110). For example, the artificial intelligence processing unit (160) may perform operations related to artificial intelligence in conjunction with the processor (110) while the processor (110) performs operations necessary for a charging / discharging control method of an energy storage device corresponding to peak power.

[0095] For example, the AI-based processing unit (160) can analyze and predict peak power patterns using AI algorithms. This can improve the peak state determination function and more accurately determine whether the amount of power flowing into the power system corresponds to a peak state. Furthermore, the AI-based processing unit (160) can optimize the charging and discharging of energy storage devices using AI. By analyzing energy demand and supply patterns, the charging and discharging strategy can be dynamically adjusted, thereby improving the lifespan and efficiency of the energy storage device.

[0096] FIG. 3 is a flowchart for explaining a charging / discharging control method of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0097] A method for controlling charging and discharging of an energy storage device in response to peak power can be performed in a renewable energy-based power supply system management device including a memory storing one or more programs for detecting peak power and controlling charging or discharging of an energy storage device, and one or more processors performing operations according to one or more programs.

[0098] At step S310, the processor can determine whether the amount of power flowing in from the power system corresponds to a peak state based on a peak state determination function that uses a predetermined peak power amount as a variable.

[0099] In the step (S310) of determining whether the processor is in a peak state, if the amount of power flowing in from the power system after the preset cycle starts is greater than the peak state determination function, the processor can determine that the processor is in a peak state.

[0100] In the step (S310) of determining whether the processor corresponds to a peak state, the processor can measure the amount of power flowing in from the power system for a predetermined first time within a preset cycle, and determine whether the processor corresponds to a peak state after the predetermined first time has elapsed.

[0101] At step S320, when the processor corresponds to a peak state, the energy storage device can be controlled to discharge in response to the discharge amount calculated through a discharge amount calculation function that uses the amount of power flowing in from the power system as a variable.

[0102] In the step (S320) of controlling the energy storage device to discharge, the processor can control the energy storage device to stop discharging whenever a preset cycle ends.

[0103] FIG. 4 is a drawing for explaining a power supply device of a renewable energy-based power supply system according to one embodiment of the present invention and an external device that receives power from the power supply device.

[0104] An external device (410) that receives power from a power supply may be a plug-in hybrid electric vehicle (PHEV) or an electric vehicle (EV) that removes the engine and supplies power only with a motor.

[0105] PHEVs and EVs use externally supplied power to charge a high-voltage battery installed inside the vehicle, and supply power to the drive motor for driving the vehicle by controlling the discharge of the power charged in the high-voltage battery.

[0106] Referring to FIG. 4, the external device (410) is illustrated in the form of a PHEV or EV, but the present invention is not limited thereto, and may be various types of devices that are designed to charge a battery installed inside a device such as a smartphone, laptop, tablet, smart watch, e-cigarette, portable speaker, electric kickboard, electric bicycle, or drone.

[0107] FIG. 5 is a drawing for explaining an eco-friendly energy generation device and a configuration of an eco-friendly energy generation device of a renewable energy-based power supply system according to one embodiment of the present invention.

[0108] Referring to FIG. 5, the eco-friendly energy generation device (500) may include at least one of a solar panel (510), a wind turbine (520), a hydraulic turbine (530), or an ocean energy generation device (540).

[0109] A solar panel (510) can directly convert solar energy into electrical energy. The solar panel (510) can be installed on a roof, on the exterior wall of a building, or in a large-scale solar power plant.

[0110] A wind turbine (520) may be a large turbine that generates electricity by utilizing wind energy. The wind turbine (520) may include blades, a rotating shaft, a generator, a turbine tower, and a blade adjustment device.

[0111] A hydraulic turbine (530) can generate electricity by utilizing the flow or fall of water.

[0112] An ocean energy generation device (540) can generate electricity by utilizing the movement of the sea, such as waves, tides, and ocean currents.

[0113] Not all of the components illustrated in FIG. 5 are essential components of the eco-friendly energy generation device (500), and some components connected to the eco-friendly energy generation device (500) in other embodiments may be added, changed, or deleted.

[0114] For example, an eco-friendly energy generation device (500) may further include a geothermal power generation device or a biomass power generation device. A geothermal power generation device can generate electricity by utilizing heat within the Earth. A biomass power generation device can generate electricity by combusting or gasifying biological materials.

[0115] FIG. 6 is a graph showing a peak state judgment function and a discharge amount calculation support function used in a charging / discharging control device and method of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0116] Drawing symbol 610 of Fig. 6 represents a peak state judgment function. Drawing symbol 630 represents a preset cycle (900 seconds).

[0117] The peak state judgment function can use at least one of a predetermined peak power amount, a preset period, or the elapsed time since the preset period started as a variable.

[0118] For example, the peak state judgment function may be the sum of a first value obtained by multiplying a predetermined peak power amount divided by a predetermined period by the time elapsed since the predetermined period began, and a second value obtained by multiplying a predetermined peak power amount by an adjustment value less than 1.

[0119] The peak state judgment function can be expressed as in mathematical equation 1.

[0120]

[0121] Here, Limit curve2 represents the peak state judgment function, and t can represent the time elapsed since the preset cycle begins. The adjustment value can be determined within the range of 0.03 to 0.07.

[0122] The adjustment value can be determined so that the peak state judgment function has a value greater than the discharge amount calculation support function. The adjustment value can be a value greater than 0.

[0123] The peak state judgment function may be limited to a function value equal to a size corresponding to a predetermined peak power amount if the size of the peak state judgment function is greater than a predetermined peak power amount.

[0124] The discharge amount calculation function can use the amount of power flowing in from the power system and the discharge amount calculation support function as variables.

[0125] The discharge amount calculation support function can use a predetermined peak power amount or a preset cycle as a variable.

[0126] Drawing symbol 620 of Fig. 6 represents a discharge amount calculation support function.

[0127] The discharge amount calculation support function can be expressed as in mathematical expression 2.

[0128]

[0129] Here, Limit curve 1 represents a discharge amount calculation support function, and t can represent the time elapsed since the preset cycle starts.

[0130] The discharge amount calculation function may be set to a function value equal to the size of the rated voltage of the energy storage device when a predetermined second time has elapsed within a predetermined period and the amount of power flowing in from the power system is greater than a predetermined peak power amount.

[0131] The predetermined second time may have a greater value than the predetermined first time.

[0132] In the present invention, the predetermined first time or the predetermined second time may be determined by factors such as user settings, system limitations, or power usage patterns, respectively.

[0133] The emission calculation function can be expressed as in mathematical equation 3.

[0134]

[0135] Here, Pess_ref can represent the discharge amount. The unit conversion constant can be a constant for adjusting the unit so that the calculated discharge amount is calculated in KW when the unit of the power amount flowing in from the power system and the discharge amount calculation support function are input in Wh instead of KWh and the preset cycle is input in sec (seconds). For example, since Pess_ref = ([Wh]-[Wh]) / [s] = [Wh] / [s] = 3.6[kW], the unit conversion constant can be 3.6.

[0136] The discharge output function may have a value smaller than the rated voltage of the energy storage device.

[0137] The emission calculation function may have a value less than the charging power used by an external device powered by the energy storage device minus the supply power provided by the renewable energy generation device that supplies power to the energy storage device.

[0138] The emission output function can have values ​​greater than 0.

[0139] FIGS. 7 to 9 are diagrams exemplarily showing time-to-power graphs according to the operation of a charging / discharging control device and method of an energy storage device corresponding to peak power according to one embodiment of the present invention.

[0140] In the present invention, the processor performs operations at preset cycle intervals, and at the end of each cycle, controls the energy storage device to stop discharging and initializes all parameters.

[0141] The "preset cycle" can be determined by the system operator or user, and may be determined based on factors such as the system operating environment or the characteristics of the energy storage device. For example, if the power grid is highly volatile and peak power conditions occur frequently, a short cycle can be set to quickly detect and respond to peak conditions. Conversely, if the power grid is less volatile and peak conditions occur infrequently, a long cycle can be set to more efficiently manage the charging and discharging of the energy storage device.

[0142] Figures 7 to 9 are examples of a case where the preset period is set to 900 seconds, the predetermined first time is set to 300 seconds, and the predetermined second time is set to 600 seconds.

[0143] The processor measures power usage for a first predetermined time period, and thereafter performs operations related to peak judgment or energy storage device control. The processor may determine a peak state if, after the first predetermined time period has elapsed, the amount of power (SkWh) flowing in from the power system exceeds a peak state judgment function (Limit curve2).

[0144] The amount of power (SkWh) flowing into the power grid can mean the amount of power flowing into the power grid since the start of a preset cycle.

[0145] In Figures 7 to 9, the peak state judgment function is calculated by the following equation.

[0146] Limit curve2 = Peak_kwh / (900) * t + Peak_kwh * 0.05

[0147] Here, "Peak_kwh" is a predetermined peak power amount, which represents the peak power amount during a preset period, and "t" can represent the time (in seconds) from the start of the 15-minute period to the present.

[0148] If "Limit curve2" is greater than "Peak_kwh", "Limit curve2" can be limited to "Peak_kwh".

[0149] The processor can issue a discharge command to the energy storage device when a preset period of time has elapsed and SkWh exceeds the "Limit curve2".

[0150] In Figures 7 to 9, the discharge amount (Pess_ref) is calculated by the following equation.

[0151] Pess_ref[kW] = 3.6*((Skwh - Limit curve1) / (900 - t))

[0152] Here, “Limit curve1 (emission calculation support function)” is calculated by “Limit curve1 = Peak_kwh / (900)t”.

[0153] After a predetermined second time has elapsed and SkWh is greater than Peak_kwh, Pess_ref = Pess_rate can be set.

[0154] Pess_rate may be the rated capacity of an energy storage device. For example, Pess_rate may refer to the rated capacity of an Energy Storage System Power Conditioning System (ESSPCS). An ESSPCS may be a device that controls the power flow between the battery and the grid in an energy storage system.

[0155] Limits for Peak command may include at least one of Pess_ref < Pev-Ppv, Pess_ref < Pess_rate, or Pess_ref > 0.

[0156] In the simulations of FIGS. 7 to 9, the rated capacity of the ESSPCS is 460 kW, the power supplied to the external device (EV) from the power supply is 600 kW, and the Peak_kwh is 125 kWh.

[0157] First, referring to Figure 7, at 230 sec, Skwh exceeds Limit_curve2 but is less than or equal to 300, so Pess_ref=0, and at 300 sec, Skwh exceeds Limit_curve2 and Pess output begins. After 840 sec, the previous value is maintained.

[0158] If the peak is not controlled, it can rise to 150 kWh as shown in Fig. 8.

[0159] Referring to Fig. 9, at 230 sec, Skwh exceeds Limit_curve2 but is less than or equal to 300, so Pess_ref=0. At 300 sec, Skwh exceeds Limit_curve2 and Pess output begins. At 680 sec, Skwh becomes lower than Limit_curve1, so Pess=0.

[0160] FIG. 10 is a diagram illustrating an operation algorithm of a charge / discharge control method of an energy storage device corresponding to peak power according to one embodiment of the present invention in the form of code.

[0161] FIG. 11 is a drawing for explaining the configuration of a charge / discharge control device of an energy storage device corresponding to peak power according to another embodiment of the present invention.

[0162] Referring to FIG. 11, a charge / discharge control device (1100) of an energy storage device corresponding to peak power according to another embodiment of the present invention may include a peak state determination unit (1110), an energy storage device control unit (1120), a peak state determination function calculation unit (1130), a discharge amount calculation function calculation unit (1140), and an artificial intelligence-based processing unit (1150).

[0163] That is, in the present invention, one or more processors that perform operations according to one or more programs for controlling charging and discharging of an energy storage device corresponding to peak power stored in a memory may be a peak state determination unit (1110), an energy storage device control unit (1120), a peak state determination function calculation unit (1130), a discharge amount calculation function calculation unit (1140), and an artificial intelligence-based processing unit (1150), and the operations performed in the processor may be divided and performed by the peak state determination unit (1110), the energy storage device control unit (1120), the peak state determination function calculation unit (1130), the discharge amount calculation function calculation unit (1140), and the artificial intelligence-based processing unit (1150) according to their respective roles.

[0164] The peak state determination unit (1110) can determine whether the amount of power flowing into the power system corresponds to a peak state based on a peak state determination function. The peak state determination unit (1110) can also calculate the peak state determination function using a predetermined peak power amount, a preset cycle, or the time elapsed since the cycle starts as variables. The peak state determination unit (1110) can determine whether the amount of power corresponds to a peak state based on the calculation result.

[0165] When the peak state is reached, the energy storage device control unit (1120) can control the energy storage device to discharge in response to the discharge amount calculated through the discharge amount calculation function using the amount of power flowing in from the power system as a variable. The energy storage device control unit (1120) can also calculate the discharge amount using the amount of power flowing in from the power system and the discharge amount calculation support function as variables. The energy storage device control unit (1120) can control the discharge of the energy storage device according to the calculated discharge amount.

[0166] The peak state judgment function calculation unit (1130) can perform calculation of the peak state judgment function. The peak state judgment function calculation unit (1130) can calculate the peak state judgment function using a predetermined peak power amount, a preset cycle, or the time elapsed since the cycle starts as variables.

[0167] The discharge amount calculation function calculation unit (1140) can perform calculation of the discharge amount calculation function. The discharge amount calculation function calculation unit (1140) can calculate the discharge amount by using the amount of power flowing in from the power system and the discharge amount calculation support function as variables. The discharge amount calculation function calculation unit (1140) can also set the discharge amount by comparing whether a second time set within a preset period has elapsed with the amount of power.

[0168] The AI-based processing unit (1150) can perform additional processing using AI technology. For example, the AI-based processing unit (1150) can optimize peak state determination or discharge calculation functions using machine learning algorithms, or predict peak power states by analyzing real-time data.

[0169] Not all of the configurations illustrated in FIG. 11 are essential components of the renewable energy-based power supply system management device (1100), and in other embodiments, some configurations connected to the charge / discharge control device (1100) of the energy storage device corresponding to peak power may be added, changed, or deleted.

[0170] The present invention relates to a device and method for controlling the charging and discharging of an energy storage system (ESS) in response to peak power. The present invention may include a program and processor that monitors the amount of power flowing into the power system based on a preset peak power amount, determines a peak state, and controls the discharging of the ESS.

[0171] The present application also provides a computer storage medium. The computer storage medium stores program instructions, and when the program instructions are executed by a processor, the charging / discharging control method of an energy storage device corresponding to the aforementioned peak power is realized.

[0172] A computer storage medium according to one embodiment of the present invention may be, but is not necessarily limited to, a U disk, an SD card, a PD optical drive, a mobile hard disk, a large-capacity floppy drive, a flash memory, a multimedia memory card, a server, etc.

[0173] Even though all components constituting the embodiments of the present invention described above are described as being combined as one or operating in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the purpose of the present invention, all of the components may be selectively combined and operated one or more times. In addition, although all of the components may be implemented as individual independent hardware, some or all of the components may be selectively combined and implemented as a computer program having program modules that perform some or all of the functions of the combined hardware in one or more pieces. In addition, such a computer program may be stored in a computer-readable medium such as a USB memory, a CD disk, or a flash memory, and read and executed by a computer, thereby implementing the embodiments of the present invention. The recording medium of the computer program may include a magnetic recording medium, an optical recording medium, etc.

[0174] The above description is merely an example of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications, changes, and substitutions may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of ​​the present invention, but rather to explain it, and the scope of the technical idea of ​​the present invention is not limited by these embodiments and the accompanying drawings. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

[0175] < Explanation of symbols >

[0176] 10: Renewable energy-based power supply system

[0177] 100: Charging / discharging control device of energy device corresponding to peak power

[0178] 200: Power system

[0179] 300: Power supply

[0180] 400: Energy storage device

[0181] 500: Renewable energy generation device

[0182] 600: Power Supply System Management Unit

Claims

1. A memory storing one or more programs for detecting peak power and controlling charging or discharging of an energy storage device; and one or more processors performing operations according to the one or more programs; wherein the operations performed by the processor include: A step of determining whether the amount of power flowing in from the power system corresponds to a peak state based on a peak state determination function that uses a predetermined peak power amount as a variable; and A charging / discharging control device for an energy storage device corresponding to peak power, comprising: a step of controlling the energy storage device to discharge in response to a discharge amount calculated through a discharge amount calculation function that uses the amount of power flowing in from the power system as a variable when the peak state is corresponded to; 2. In paragraph 1, The step of determining whether the above peak state is met is: A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that when the amount of power flowing in from the power system after a preset cycle starts is greater than the peak state judgment function, the device determines that the device is in a peak state.

3. In paragraph 2, The above peak state judgment function is, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that at least one of the predetermined peak power amount, the preset period, or the elapsed time since the start of the preset period is used as a variable.

4. In paragraph 3, The above peak state judgment function is, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that the charge / discharge control device is the sum of a first value obtained by multiplying the value obtained by dividing the predetermined peak power by the predetermined cycle by the time elapsed since the predetermined cycle began, and a second value obtained by multiplying the predetermined peak power by an adjustment value less than 1.

5. In paragraph 2, The above discharge amount calculation function is, It uses the function to support calculation of the amount of power flowing in and the amount of discharge from the above power system as variables, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that the discharge amount calculation support function uses the predetermined peak power amount or the preset cycle as a variable.

6. In paragraph 2, The above discharge amount calculation function is, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that when a predetermined second time has elapsed within the predetermined cycle and the amount of power flowing in from the power system is greater than the predetermined peak power amount, a function value is set to a size equal to the size of the rated voltage of the energy storage device.

7. In paragraph 1, The above peak state judgment function is, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that when the size of the peak state judgment function is greater than the predetermined peak power amount, the function value is limited to a size equal to the size corresponding to the predetermined peak power amount.

8. In paragraph 1, The above processor, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that it controls the energy storage device to stop discharging whenever the preset cycle ends.

9. In paragraph 1, The above processor, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that it measures the amount of power flowing in from the power system for a predetermined first time within the predetermined cycle, and determines whether the peak state is reached after the predetermined first time has elapsed.

10. In paragraph 1, The above emission calculation function is, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that it has a value smaller than the size of the rated voltage of the energy storage device.

11. In paragraph 1, The above emission calculation function is, A charging / discharging control device for an energy storage device corresponding to peak power, characterized in that the charging power used by an external device supplied with power from the energy storage device has a value smaller than the value obtained by subtracting the supply power provided by a renewable energy generation device that supplies power to the energy storage device.

12. In paragraph 1, The above emission calculation function is, A charge / discharge control device for an energy storage device corresponding to peak power, characterized in that it has a value greater than 0.

13. A method for controlling charging and discharging of an energy storage device in response to peak power, performed in a device including a memory storing one or more programs for detecting peak power and controlling charging or discharging of an energy storage device, and one or more processors performing operations according to the one or more programs, A step of determining whether the amount of power flowing in from the power system corresponds to a peak state based on a peak state determination function that uses a predetermined peak power amount as a variable; and A method for controlling charging and discharging of an energy storage device corresponding to peak power, comprising: a step of controlling the energy storage device to discharge in response to a discharge amount calculated through a discharge amount calculation function that uses the amount of power flowing in from the power system as a variable when the peak state is corresponded to; 14. In paragraph 13, The step of determining whether the above peak state is met is: A charging / discharging control method for an energy storage device corresponding to peak power, characterized in that when the amount of power flowing in from the power system after a preset cycle starts is greater than the peak state judgment function, the peak state is determined to be present.

15. In paragraph 14, The above peak state judgment function is, A charging / discharging control method for an energy storage device corresponding to peak power, characterized in that at least one of the predetermined peak power amount, the preset period, or the elapsed time since the start of the preset period is used as a variable.

16. In paragraph 15, The above peak state judgment function is, A charging / discharging control method for an energy storage device corresponding to peak power, characterized in that the first value is obtained by multiplying the value obtained by dividing the predetermined peak power by the predetermined cycle by the time elapsed since the predetermined cycle started, and the second value is obtained by multiplying the predetermined peak power by an adjustment value less than 1.

17. In paragraph 14, The above discharge amount calculation function is, It uses the function to support calculation of the amount of power flowing in and the amount of discharge from the above power system as variables, A charging / discharging control method for an energy storage device corresponding to peak power, characterized in that the discharge amount calculation support function uses the predetermined peak power amount or the preset cycle as a variable.

18. In paragraph 14, The above discharge amount calculation function is, A charging and discharging control method of an energy storage device corresponding to peak power, characterized in that when a predetermined second time elapses within the predetermined cycle and the amount of power flowing in from the power system is greater than the predetermined peak power amount, a function value is set to a size equal to the size of the rated voltage of the energy storage device.

19. A computer program stored in a computer-readable recording medium for executing a method for controlling charging and discharging of an energy storage device corresponding to peak power as described in any one of Articles 13 to 18 on a computer.

20. Renewable energy generation devices that generate electricity using wind or solar power; An energy storage device that stores power provided from the above renewable energy power generation device; power grid that supplies electricity; and A power supply system based on renewable energy, comprising: a charging / discharging control device for an energy storage device corresponding to peak power, which determines whether the amount of power flowing in from a power system corresponds to a peak state based on a peak state judgment function that uses a predetermined peak power amount as a variable, and, if it corresponds to the peak state, controls the energy storage device to discharge in response to a discharge amount calculated through a discharge amount calculation function that uses the amount of power flowing in from the power system as a variable.

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