On-off grid Switching Electrolysis System and Its Control Method through Real-time Data Linkage

Abstract

The present invention relates to an on / off grid switching water electrolysis system through real-time data linkage and a control method thereof, which predicts renewable energy generation using real-time weather data and automatically switches the power supplied to the water electrolysis system in real time according to real-time electricity rates and power supply and demand information through an external power grid and the status of an energy storage device, so as to increase the utilization rate of renewable energy while reducing the production cost of hydrogen. An on / off grid switching water electrolysis system through real-time data linkage according to the present invention for solving the above problem comprises: an eco-friendly power generation system; an external power grid; an energy storage device; a water electrolysis system; and a power prediction and supply unit, wherein the power prediction and supply unit comprises: a renewable energy generation amount prediction unit; an external power information collection unit; an energy storage device status detection unit; a power supply switching unit; and a control unit.

Description

Technology Field

[0001] The present invention relates to an on / off grid switching water electrolysis system and a control method thereof through real-time data linkage, and more specifically, to a water electrolysis system and a control method thereof in which power is applied by selecting between renewable energy (Off-grid) produced through an eco-friendly power generation system and grid power (On-grid) supplied through KEPCO's external power grid. Background Technology

[0002] A water electrolysis system is a system that produces hydrogen and oxygen by electrolyzing water. While such systems are generally configured to be powered on-grid through an external power grid like KEPCO, development is currently underway to efficiently produce hydrogen by configuring them to be powered off-grid through eco-friendly power generation systems.

[0003] As prior art for the above purpose, the hybrid green water production system and method of operation thereof disclosed in Korean Patent Publication No. 2024-0155815 (hereinafter referred to as the 'Patent Document') is disclosed.

[0004] The above patent document describes a power generation unit that generates power using a new and renewable energy source; an energy storage unit that stores electrical energy produced by the power generation unit and performs auto-balancing during normal operation; a hydrogen production unit that produces hydrogen using the electrical energy produced by the power generation unit; a hydrogen storage unit that stores hydrogen produced by the hydrogen production unit; a fuel cell unit that produces electrical energy by combining hydrogen and oxygen stored in the hydrogen storage unit; and a selection unit that selectively supplies electrical energy produced by the power generation unit to the energy storage unit and the hydrogen production unit, wherein the selection unit comprises a power input unit that receives power produced by the power generation unit; a charge state detection unit that detects the charge state of the energy storage unit; an information input unit that inputs information on the power generation duration; and a control unit that determines the charge state information of the energy storage unit input through the charge state detection unit and the input information of the information input unit, and performs control according to the determination result. The distribution unit includes a power input unit that distributes power input through the power input unit to the energy storage unit and the hydrogen production unit according to the control of the control unit, wherein when the charging ratio of the energy storage unit is greater than or equal to a first reference value, the electrical energy of the power production unit is supplied only to the hydrogen production unit, and when the power generation sustainability time information input through the information input unit is checked and the charging ratio of the energy storage unit is insufficient as reserve power but there is a possibility that the power currently produced by the power production unit will continue to be produced for more than a set time, the electrical energy of the power production unit is distributed and supplied to both the hydrogen production unit and the energy storage unit to secure sufficient hydrogen energy when the charging ratio of the energy storage unit is less than the first reference value and greater than or equal to a second reference value, and the electrical energy of the power production unit is distributed to both the hydrogen production unit and the energy storage unit according to the sustainability of power production by the power production unit determined by information from a weather forecasting agency.Depending on the degree to which the charge state of the energy storage unit is close to the first reference value or the second reference value, the power from the power production unit supplied to the hydrogen production unit is distributed differentially. If the charge ratio of the energy storage unit is less than the second reference value, all electrical energy from the power production unit is supplied to the energy storage unit. The energy storage unit includes a plurality of battery units, and the battery units are classified into a charging group or a discharging group according to the initial voltage value. In a charging mode, the charging group performs charging, and in a discharging mode, the discharging group performs discharging, thereby performing charging or discharging operations and performing auto-balancing. The auto-balancing is performed without a direct processing step for auto-balancing, but by grouping all batteries within the safe voltage reference range to charge or discharge while performing normal operation according to the operation mode of the energy storage unit based on the operation of the power production unit and the power exchange grid. The processor of the power conversion unit, which includes a DC / DC converter, a DC / AC converter, and a processor, identifies a specific battery having the highest voltage and a battery having the lowest voltage among all batteries in the battery unit, and respectively classifies them into a maximum voltage battery and a minimum voltage battery. After designation, all other batteries are checked to identify batteries within the maximum voltage battery's voltage and the set safety voltage range, and group them into a discharge group; and identify batteries within the minimum voltage battery's voltage and the set safety voltage range, and group them into a charge group, thereby preventing overcharging or over-discharging when batteries belonging to each group are charged or discharged simultaneously.

[0005] However, the aforementioned patent document describes a method in which electricity produced by a power generation unit or electricity from a power exchange is stored in an energy storage unit, and the electricity stored in the energy storage unit is supplied to a hydrogen production unit. Although the system is controlled to supply electricity through the optimal battery based on the charge and discharge status of multiple batteries, this method aims solely to supply electricity to the hydrogen production unit without considering changes in the power generation amount of the power generation unit or the electricity rates of the power exchange. Consequently, there is a problem in that it is difficult to maximize the utilization of renewable energy or reduce the unit cost of hydrogen production.

[0006] Therefore, there is a need to develop an electrolysis system with an improved structure and a control method thereof that can automatically switch and supply power to the electrolysis system in real time according to the amount of renewable energy generated, the power supply status of the external power grid, and electricity rates. Prior art literature

[0007] KR 10-2024-0155815 A (2024. 10. 29.)KR 10-2024-0167746 A (2024. 11. 28.)KR 10-2024-0099082 A (2024. 06. 28.)KR 10-2331300 B1 (November 22, 2021) The problem to be solved

[0008] The present invention was devised to solve the problems of the conventional water electrolysis system described above. The objective of the present invention is to provide an on / off grid switching water electrolysis system and a control method thereof through real-time data linkage, which predicts the amount of renewable energy generated using real-time weather data and automatically switches the power supplied to the water electrolysis system in real time according to real-time electricity rates and power supply and demand information through the external power grid and the status of the energy storage device, thereby increasing the utilization rate of renewable energy while reducing the production cost of hydrogen. means of solving the problem

[0009] An on / off grid switching water electrolysis system through real-time data linkage according to the present invention for solving the above problem comprises: an eco-friendly power generation system comprising one or more selected from wind, solar, wave, and tidal power generation to produce renewable energy power; an external power grid supplying external grid power; an energy storage device that selectively stores power applied from the eco-friendly power generation system; a water electrolysis system to which power is applied through the eco-friendly power generation system, the external power grid, and the energy storage device; and a power prediction and supply unit that controls the application of power to the water electrolysis system from any one of the eco-friendly power generation system, the external power grid, and the energy storage device that meets preset conditions, wherein the power prediction and supply unit comprises: a renewable energy generation amount prediction unit that predicts the renewable energy generation amount produced through the eco-friendly power generation system based on real-time weather data from the Korea Meteorological Administration; and an external power information collection unit that collects real-time power rate information of grid power supplied through the external power grid and information on the supply and demand status of grid power. The system is characterized by comprising: an energy storage device status detection unit that detects the state of charge (SOC), state of charge / discharge (SOH), state of power operation (SOP), and temperature status of the energy storage device; a power supply switching unit that causes power selected from the renewable energy, the grid, and the energy storage device to be supplied to the electrolysis system; and a control unit that controls the power supplied to the electrolysis system by controlling the operation of the power supply switching unit based on information obtained through the renewable energy generation prediction unit, the external power information collection unit, and the energy storage device status detection unit.

[0010] In addition, the water electrolysis system of the present invention is one selected from AWE (Alkaline Water Electrolysis), PEM (Proton Exchange Membrane Electrolysis), and AEM (Anion Exchange Membrane Electrolysis) systems, and the control unit is further characterized by controlling to perform a preheating operation before reaching rated operation when the predicted value of the renewable energy generation is greater than or equal to a set standard.

[0011] In addition, the control unit of the present invention is further characterized by controlling the AC / DC converter during the initial startup of the water electrolysis system so that the applied load increases in stages.

[0012] In addition, the control unit of the present invention is further characterized by controlling the system to store excess power in the energy storage device when, during the operation of the water electrolysis system using renewable energy power, the predicted value of the renewable energy generation exceeds the power consumption of the water electrolysis system.

[0013] Meanwhile, the control method of an on / off grid switching water electrolysis system through real-time data linkage according to the present invention comprises: a renewable energy generation amount collection step in which a renewable energy generation amount predicted based on real-time weather data from the Korea Meteorological Administration is collected through a renewable energy generation amount prediction unit of a power prediction supply unit; an external power information collection step in which real-time electricity rates and grid power supply and demand information are collected, respectively, through an external power information collection unit of the power prediction supply unit; an energy storage device status detection step in which the charge rate (SOC), charge / discharge state (SOH), power status (SOP), and temperature status of the energy storage device are detected through an energy storage device status detection unit of the power prediction supply unit; a power supply step in which a power supply switching unit is controlled to supply a selected power among renewable energy power, grid power, and stored power of the energy storage device to the water electrolysis system by comprehensively determining the collected renewable energy generation amount, electricity rates, and energy storage device status through a control unit of the power prediction supply unit; and a stepwise load control step in which an AC / DC converter is controlled through the control unit to control the load applied during the initial startup of the water electrolysis system in steps. Effects of the invention

[0014] According to the present invention, there is an advantage in that economic feasibility can be enhanced by reducing grid power usage during high-power hours and lowering hydrogen production costs through real-time electricity rates, power supply and demand status, and prediction of power generation from eco-friendly power generation systems, while maximizing the use of renewable energy.

[0015] In addition, since the load is increased in stages by controlling the AC / DC converter, there is an advantage in preventing damage to the electrolysis stack and abnormal operation caused by a sudden increase in load before the electrolyte of the water electrolysis system reaches the normal operating temperature. Brief explanation of the drawing

[0016] FIG. 1 is a configuration diagram showing an example of an on / off grid switching water electrolysis system through real-time data linkage according to the present invention. FIGS. 2 and FIGS. 3 are flowcharts showing a control method of an on / off grid switching water electrolysis system through real-time data linkage according to the present invention. Specific details for implementing the invention

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0018] The present invention aims to provide an on / off grid switching water electrolysis system and a control method thereof through real-time data linkage, which predicts the amount of renewable energy generated using real-time weather data and automatically switches and supplies power to the water electrolysis system in real time according to real-time electricity rates and power supply and demand information through an external power grid and the status of an energy storage device, thereby increasing the utilization rate of renewable energy while reducing the production cost of hydrogen. As shown in FIG. 1, the present invention includes an eco-friendly power generation system (1), an external power grid (2), an energy storage device (3), a water electrolysis system (4), and a power prediction and supply unit (5).

[0019] The eco-friendly power generation system (1) is configured to produce renewable energy power by being composed of one or more selected from wind power, solar power, wave power, and tidal power generation. The eco-friendly power generation system (1) can be configured by selecting from various known types of eco-friendly power generation systems to facilitate implementation by a person skilled in the art, and accordingly, a detailed description of the configuration of the eco-friendly power generation system (1) is omitted.

[0020] Meanwhile, renewable energy produced through the eco-friendly power generation system (1) is configured to be selectively supplied to an energy storage device (3) or a water electrolysis system (4) through the power prediction supply unit (5) described later.

[0021] The external power grid (2) is external system power supplied through the Korea Electric Power Corporation or the Korea Power Exchange, and this external power grid (2) is configured to be selectively supplied to the electrolysis system (4) according to real-time power rate information and information on the supply and demand status of system power collected through the power prediction supply unit (5) described later.

[0022] The energy storage device (3) is configured to selectively store power supplied from the eco-friendly power generation system (1) and to selectively supply the stored power to the water electrolysis system (4) by the power prediction supply unit (5).

[0023] As shown in FIG. 1, this energy storage device (3) is configured such that renewable energy produced in an eco-friendly power generation system (1) passes through a transformer (6) to convert the input voltage to a set voltage, and then passes through a power conversion device (7, PCS) to improve the quality of the power, and then is charged into the energy storage device (3).

[0024] At this time, the energy storage device (3) is monitored in real time through the power prediction supply unit (5) described later, such as the state of charge (SOC), state of health (SOH), state of power (SOP), and temperature, thereby preventing the energy storage device (3) from being discharged or overcharged.

[0025] Although it was described above that the status of the energy storage device (3) is detected in real time through the power prediction supply unit (5), it can be changed so that real-time status information is transmitted to the power prediction supply unit (5) through the BMS (Battery Management System) installed in the energy storage device (3).

[0026] The water electrolysis system (4) is configured such that power is supplied from one or more selected from an eco-friendly power generation system (1), an external power grid (2), and an energy storage device (3) by the selection of the power prediction supply unit (5), and through this, water (electrolyte) is electrolyzed to produce hydrogen and oxygen.

[0027] The water electrolysis stack of this water electrolysis system (4) is formed in a stacked form of multiple cells including an anode electrode (not shown), a cathode electrode (not shown), a membrane (not shown), a separator (not shown), an end plate (not shown), and a gasket (not shown), and the hydrogen and oxygen generated through the water electrolysis stack pass through a pre-filter (not shown), a gas-liquid separator, etc., so that the hydrogen and oxygen are separated from the water (electrolyte), and then the hydrogen is purified to a high purity and stored.

[0028] And the water electrolysis system (4) according to the present invention may be composed of any one of the known and widely known systems, such as AWE (Alkaline Water Electrolysis), PEM (Proton Exchange Membrane Electrolysis), and AEM (Anion Exchange Membrane Electrolysis).

[0029] In addition, the power supplied to the water electrolysis system (4) is configured such that the voltage input through the transformer (6) is converted to a preset voltage, and then passes sequentially through the AC / DC converter (8) and the rectifier (9) to be applied to the water electrolysis system (4). At this time, the AC / DC converter (8) is configured so that the load rate is controlled to a preset ratio through the control unit (50) of the power prediction supply unit (5) described later.

[0030] The power prediction supply unit (5) is configured to control the supply of power from one of the following sources—an eco-friendly power generation system (1), an external power grid (2), and an energy storage device (3)—to the water electrolysis system (4) to meet pre-set conditions (e.g., economic efficiency, renewable energy utilization rate, operational sustainability, safety, etc.), thereby maximizing the use of renewable energy and thereby lowering the hydrogen production cost to increase economic efficiency.

[0031] The power prediction and supply unit (5) may be composed of a control device including a processor, memory, and a communication module, and the power prediction and supply unit (5) may also include a renewable energy generation amount prediction unit (10) that predicts the renewable energy generation amount produced through the eco-friendly power generation system (1) based on real-time weather data from the meteorological agency as shown in FIG. 1, an external power information collection unit (20) that collects real-time power rate information of grid power supplied through the external power grid (2) and information on the supply and demand status of grid power, an energy storage device status detection unit (30) that detects the state of the energy storage device (3), such as the charging rate, charge / dischargeable power, and temperature, a power supply switching unit (40) that causes one of the power selected from renewable energy, grid, and energy storage device to be supplied to the water electrolysis system (4), and a power supply switching unit (40) that controls the operation of the power supply switching unit (40) based on information obtained through the renewable energy generation amount prediction unit (10), the external power information collection unit (20), and the energy storage device status detection unit (30) for water electrolysis It may be configured to include a control unit (50) that controls the power supplied to the system (4).

[0032] At this time, the renewable energy generation amount prediction unit (10) obtains weather information from the weather agency in real time via the internet and predicts the amount of power generated by the eco-friendly power generation system (1) according to the weather conditions. As the actual power generation amount data and weather information such as temperature, humidity, date, time, wind direction and wind speed are accumulated and stored in this renewable energy generation amount prediction unit (10), the error between the actual renewable energy generation amount and the predicted amount is continuously corrected, and as a result, the accuracy of the renewable energy generation amount prediction naturally improves as the operating time progresses, and the predicted renewable energy generation amount prediction value is transmitted in real time to the control unit (50).

[0033] In addition, the external power information collection unit (20) collects real-time information on the comparison of electricity rates by time of day and the power supply and demand status of the external power network (2) supplied through KEPCO or the Korea Power Exchange, and transmits it to the control unit (50).

[0034] And the energy storage device status detection unit (30) monitors the status of the energy storage device (3), such as the charging rate, charging / discharging status, charging / discharging power, and temperature, in real time, and the detected information is transmitted to the control unit (50) in real time.

[0035] Meanwhile, the control unit (50) receives the predicted renewable energy generation amount predicted through the renewable energy generation amount prediction unit (10), real-time power rate and power supply status information collected through the external power information collection unit (20), and status information such as the charging rate (SOC), charging / discharging status (SOH), power status (SOP), and temperature of the energy storage device (3) detected through the energy storage device status detection unit (30), and calculates the power cost required for unit hydrogen production in real time based on the various information received, and controls the switching operation of the power supply switching unit (40) so that the power with the minimum cost is selected and supplied to the water electrolysis system (4).

[0036] At this time, the control unit (50) can control the preheating operation to be performed before reaching rated operation when the predicted value of renewable energy generation is greater than or equal to the set standard, and more specifically, the control unit (50) can control the AC / DC converter (8) so that the load is increased stepwise according to the temperature, pressure, time, or gas concentration standard of the electrolyte during the initial startup of the water electrolysis system (4).

[0037] This prevents abnormal behavior of the system and shock (thermal shock, etc.) to the components that occur when the normal operating load is input while the temperature of the electrolyte is lower than the normal operating temperature during the initial startup of the water electrolysis system (4).

[0038] Additionally, the control unit (50) can control the energy storage device (3) to store excess power when the predicted value of renewable energy generation is greater than or equal to the power consumption of the electrolysis system (4) during operation of the electrolysis system (4), and, conversely, when the predicted value of renewable energy generation is less than the power consumption of the electrolysis system (4), control the energy storage device (3) to supply power to the electrolysis system (4) as a primary supply, and then control the grid power supplied from the external power grid (2) to be supplied as a secondary supply.

[0039] Through this, it becomes possible to stably supply power to the water electrolysis system (4) even if continuous power generation and power output of the eco-friendly power generation system (1) are not guaranteed, and at the same time, hydrogen can be produced relatively cheaply by consuming renewable energy first, and as a result, the production cost of hydrogen can be lowered and price competitiveness can be increased.

[0040] Hereinafter, a control method for an on / off grid switching water electrolysis system through real-time data linkage according to the present invention will be described in detail.

[0041] The control method of an on / off grid switching water electrolysis system through real-time data linkage according to the present invention is performed through a power prediction supply unit (5), and first, the control unit (50) collects real-time weather information through the meteorological agency as shown in FIGS. 2 and 3, and predicts the amount of renewable energy generated by the eco-friendly power generation system (1) based on this (renewable energy generation amount collection step (S10)).

[0042] Then, the control unit (50) collects information on real-time power rates and power supply and demand status of external power systems, such as KEPCO or the Power Exchange, through the external power information collection unit (20) (external power information collection step (S20)).

[0043] Afterwards, the control unit (50) determines whether the predicted value of renewable energy generation is greater than or equal to a preset reference value (e.g., 20%), and if the predicted value of renewable energy generation is less than the reference value, determines whether the power stored in the energy storage device (3) is greater than or equal to a reference value (e.g., 80%).

[0044] At this time, if the power stored in the energy storage device (3) is greater than or equal to a reference value, the power stored in the energy storage device (3) is supplied to the electrolysis system (4), and if it is less than a reference value, the grid power is controlled to be supplied to the electrolysis system (4) through the external power grid (2).

[0045] In contrast, if the predicted value of renewable energy generation is greater than or equal to the reference value, the charging amount (charging state) of the energy storage device (3) transmitted through the energy storage device status detection unit (30) is determined to be greater than or equal to a preset reference value (e.g., 80%) (energy storage device status detection step (S30)).

[0046] At this time, if the charge amount of the energy storage device (3) is less than a preset reference value, renewable energy power is supplied to the energy storage device (3) so that the energy storage device (3) is charged, and after storing the energy storage device (3) in this way, it is determined again whether the predicted value of renewable energy generation is greater than or equal to the reference value.

[0047] In addition, when the charge amount of the energy storage device (3) is greater than or equal to a preset reference value, it is determined whether the predicted value of renewable energy generation is greater than or equal to the reference value (e.g., 20%), and if it is greater than or equal to the reference value, the power is supplied to the water electrolysis system (4), and if it is less than the reference value, it returns to the starting step and determines again whether the predicted value of renewable energy generation is greater than or equal to the reference value.

[0048] Through the above process, based on the predicted value of renewable energy generation, the electricity to be supplied to the water electrolysis system (4) is supplied to the water electrolysis system (4) in order of priority among renewable energy electricity, energy storage device electricity, and grid electricity, with the electricity having a lower hydrogen production cost.

[0049] At this time, the control unit (50) can be controlled so that a load is applied in stages according to the operation status of the water electrolysis system (4) (staged load control stage (S50)). To explain in more detail, the control unit (50) controls the AC / DC converter (8) to operate in a low-load operation mode with a load rate of 20% as shown in FIG. 3.

[0050] Then, the control unit (50) checks that the pressure of the oxygen (O2) gas separator is greater than or equal to the set pressure (H), and if the pressure of the oxygen gas separator is less than the set pressure (H), the control state is maintained until it becomes greater than or equal to the set pressure (H).

[0051] And when the pressure of the oxygen gas separator is above the set pressure (H), the hydrogen sampling valve is opened, the oxygen sampling valve is opened, the hydrogen discharge valve is closed, the oxygen discharge valve is closed, and the oxygen discharge valve pressure is controlled, and at the same time, it is determined whether the predicted value of the renewable energy generation is above the set reference value (e.g., 20%).

[0052] At this time, if the predicted value of renewable energy generation is greater than the power consumption, the excess power is switched to be charged into the energy storage device (3) and the hydrogen production process is started. On the other hand, if the predicted value of renewable energy generation is less than the power consumption, the power of the energy storage device is supplied and then the hydrogen production process is started.

[0053] Subsequently, it is determined again whether the supplied power, including renewable energy and energy storage power, is greater than or equal to the consumed power; if the supplied power is less than the consumed power, grid power is supplied.

[0054] In addition, if the power supply is greater than the power consumption or if grid power is supplied, the AC / DC converter (8) is controlled at a load rate of 30%, and then the concentration of hydrogen and oxygen analyzers is checked to see if it is greater than the set allowable upper limit (H).

[0055] At this time, if the concentration of the hydrogen and oxygen analyzer is greater than or equal to the set allowable upper limit (H), it is maintained until it is less than the allowable upper limit (H), and if the concentration of the hydrogen and oxygen analyzer is less than the set allowable upper limit (H), the AC / DC converter (8) is controlled at a load rate of 60%.

[0056] Then, when operation continues at a 60% load rate and a set time (e.g., 15 minutes) has elapsed, the AC / DC converter (8) is controlled to a 100% load rate to switch to a normal operation mode, and then hydrogen is continuously produced while checking the flow rate of hydrogen.

[0057] That is, the control unit (50) of the power prediction supply unit (5) according to the present invention predicts the amount of renewable energy generated by the eco-friendly power generation system (1) based on weather information, determines the power rate and power supply status of the grid power supplied through an external power grid such as KEPCO or the Power Exchange, and comprehensively determines the state of the energy storage device, such as the charge rate (SOC), charge / discharge state (SOH), power status (SOP), and temperature, and controls the power supply switching unit (40) so that any one of the selected powers among renewable energy power, grid power, and stored power of the energy storage device is supplied to the water electrolysis system (4), and at the same time controls the AC / DC converter (8) of the water electrolysis system (4) to control the load applied during initial startup in stages, and also controls the renewable energy generation amount prediction value so that if it is greater than or equal to the power consumption of the water electrolysis system (4), the excess power is charged to the energy storage device (3), and if it is less than the power consumption of the water electrolysis system (4), the renewable energy power is charged to the energy storage device (3). Next, power from the energy storage device (3) is supplied to the water electrolysis system (4), and then, if the supplied power is less than the consumed power, additional grid power is supplied, so that, as a result, the use of renewable energy is prioritized to increase efficiency while reducing grid power consumption, thereby lowering the cost of hydrogen production.

[0058] As explained above, the present invention enables economic efficiency by reducing grid power usage during high-power hours and maximizing the use of renewable energy through real-time power rates, power supply and demand status, and prediction of power generation from eco-friendly power generation systems, thereby lowering the cost of hydrogen production.

[0059] In addition, since the load is increased in stages by controlling the AC / DC converter, damage to the electrolysis stack and abnormal operation caused by a sudden increase in load before the electrolyte of the electrolysis system reaches the normal operating temperature are prevented.

[0060] For the convenience of explanation, drawings illustrating preferred embodiments and configurations shown in the drawings have been described above using reference numerals and names; however, as this is merely one embodiment according to the present invention, the scope of the rights should not be interpreted as being limited to the shapes shown in the drawings and the assigned names. It is considered entirely obvious that modifications to various shapes predictable from the description of the invention and simple substitutions with configurations having the same function fall within the scope of modifications that a person skilled in the art can easily implement. Explanation of the symbols

[0061] 1: Eco-friendly power generation system 2: External power grid 3: Energy storage device 4: Water electrolysis system 5: Power Prediction and Supply Unit 6: Transformer 7: Power converter 8: AC / DC converter 9: Rectifier 10: Renewable energy generation prediction unit 20: External power information collection unit 30: Energy storage device status detection unit 40: Power supply switching unit 50: Control unit

Claims

Claim 1 An eco-friendly power generation system (1) that produces renewable energy power by being composed of one or more selected from wind power, solar power, wave power, and tidal power generation; an external power grid (2) that supplies external grid power; an energy storage device (3) that selectively stores power supplied from the eco-friendly power generation system (1); and a water electrolysis system (4) to which power is supplied through the eco-friendly power generation system (1), the external power grid (2), and the energy storage device (3). The system includes a power prediction supply unit (5) that controls the application of any one of the following power sources to the electrolysis system (4): the eco-friendly power generation system (1), the external power grid (2), and the energy storage device (3), provided that the power source meets preset conditions; wherein the power prediction supply unit (5) comprises: a renewable energy generation amount prediction unit (10) that predicts the renewable energy generation amount produced through the eco-friendly power generation system (1) based on real-time weather data from the Korea Meteorological Administration; an external power information collection unit (20) that collects real-time power rate information of the grid power supplied through the external power grid (2) and information on the supply and demand status of the grid power; an energy storage device status detection unit (30) that detects the charge rate (SOC), charge / discharge state (SOH), power status (SOP), and temperature state of the energy storage device (3); and a power supply switching unit (40) that causes any one of the following power sources selected from the renewable energy, grid, and energy storage device to be supplied to the electrolysis system (4). A control method for an on / off grid switching water electrolysis system through real-time data linkage, comprising: a control unit (50) that controls the power supplied to the water electrolysis system (4) by controlling the operation of the power supply switching unit (40) based on information obtained through the renewable energy generation amount prediction unit (10), the external power information collection unit (20), and the energy storage device status detection unit (30); wherein the method comprises: a renewable energy generation amount collection step (S10) that collects the renewable energy generation amount predicted based on real-time weather data from the Korea Meteorological Administration through the renewable energy generation amount prediction unit (10) of the power prediction supply unit (5);An external power information collection step (S20) for collecting real-time power rates and grid power supply and demand information, respectively, through an external power information collection unit (20) of the power prediction supply unit (5); an energy storage device status detection step (S30) for detecting the charge rate (SOC), charge / discharge state (SOH), power status (SOP), and temperature state of the energy storage device (3) through an energy storage device status detection unit (30) of the power prediction supply unit (5); and a power supply step (S40) for controlling a power supply switching unit (40) to supply a selected power among renewable energy power, grid power, and stored power of the energy storage device to the electrolysis system (4) by comprehensively determining the collected renewable energy generation amount, power rates, and energy storage device status through a control unit (50) of the power prediction supply unit (5). A method for controlling an on / off grid switching water electrolysis system through real-time data linkage, characterized by including: a stepwise load control step (S50) that controls the AC / DC converter (8) through the control unit (50) to control the load applied during the initial startup of the water electrolysis system (4) in steps. Claim 2 A method for controlling an on / off grid switching water electrolysis system through real-time data linkage according to claim 1, wherein the water electrolysis system (4) is one selected from AWE (Alkaline Water Electrolysis), PEM (Proton Exchange Membrane Electrolysis), and AEM (Anion Exchange Membrane Electrolysis), and the control unit (50) controls the system to perform a preheating operation before reaching rated operation when the predicted value of the renewable energy generation amount is greater than or equal to a set standard. Claim 3 A method for controlling an on / off grid switching water electrolysis system through real-time data linkage according to claim 1, wherein the control unit (50) controls the AC / DC converter (8) during the initial startup of the water electrolysis system (4) so ​​that the applied load increases in stages. Claim 4 A method for controlling an on / off grid switching water electrolysis system through real-time data linkage according to claim 1, wherein the control unit (50) controls the system so that when the predicted value of the renewable energy generation amount is greater than or equal to the power consumption of the water electrolysis system (4) during operation of the water electrolysis system (4) using renewable energy power, the excess power is stored in the energy storage device (3). Claim 5 delete

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