KR20180110881A - Microgrid operating method - Google Patents

Abstract

The present invention relates to a micro-grid operating method. The micro-grid operating method includes the steps of: measuring a power generation amount of at least one generator for generating electricity connected to a micro-grid; acquiring data on a power demand pattern of an electrical load connected to the micro-grid; acquiring data related to an electricity rate charged for each time zone in the operation of a micro-grid system; determining whether to use, sell, and store the electricity generated by the generator based on the power generation amount, the power demand pattern, and the electricity rate. Accordingly, the present invention can maximizing the efficiency of the micro-grid operation and reduce operation costs.

Description

MICROGRID OPERATING METHOD [0002]

The present invention relates to a microgrid operating method. More particularly, the present invention relates to a micro grid operating method capable of optimizing energy operation in connection with electric power market bidding using electricity generated from a generator.

Micro-grid is a small-scale power network that supplies power and heat independently. Recently, it has emerged as a new paradigm of power systems with the rise of small-scale distributed power generation using renewable energy.

The microgrid can be summarized as a small power grid with a small number of small distributed power sources and loads that can be operated in conjunction with or separate from existing power grids. The microgrid is a power system capable of maintaining continuous power supply to the load connected to the microgrid by using only the distributed power source, separated from the main system in the event of main / short circuit accidents and serious power quality problems.

The Micro Grid is an independent company that efficiently manages and operates the generator and load in a certain area. In addition, it is a system that incorporates various applications that can generate profits by participating in the power trading market.

In order to participate in the electric power market and manage the efficient operation of the electric power grid market, the micro grid needs to predict the electric load, establish a power generation plan based on the load prediction results, confirm the time zone for trading electricity required in the electric power market, can do.

MicroGrid can use the SCADA system (Supervisory Control And Data Acquisition) as a platform. SCADA system refers to a system in which a central control system monitors and controls a remote device by collecting, receiving, recording and displaying status information data of the remote device to a remote terminal using analog or digital signals on the communication path. The SCADA system centrally monitors and controls various types of remote facilities such as power generation, transmission and distribution facilities, petrochemical plants, steel process facilities, and factory automation facilities.

These SCADA systems are complex and deal with vast amounts of information. The information handled in the SCADA system includes real time data (RTD) acquired in real time, collected data acquired from a remote terminal unit (RTU), and operation data calculated using the data in the system .

1 is a flowchart showing a water management system used in a conventional waterworks establishment.

Referring to FIG. 1, the conventional water management system acquires waterworks information flowing into a waterworks establishment (S10).

Next, the demand forecast of the users is performed using the waterworks information (S20).

Then, a supply schedule is calculated at each point based on the demand forecast (S30).

Then, based on the supply schedule, the operating system is operated and managed (S40).

In the conventional operation method of the water management system, a large amount of electric power is used to operate the water service establishment, but the energy efficiency is low from the viewpoint of energy.

In addition, as the energy-related projects have recently emerged, new sources of renewable energy (solar, hydro, wind, etc.) have been added to the idle sites in the project sites and used for water and wastewater processing. However, in the case of these new power generation resources, there is a problem that they are independently operated, and the energy to be produced is not efficiently managed.

An object of the present invention is to construct a water service establishment as a microgrid to improve the energy independence rate.

The present invention relates to a micro grid operating system for determining whether to use, sell and store electricity generated by at least one generator so as to enable energy optimum operation in connection with the electric power market bidding and to serve as a power generator, And a method thereof.

Further, the present invention determines the operating mode of the energy storage device (ESS) connected to the at least one generator based on the power generation amount of at least one generator, the user's power demand pattern, and the hourly power cost, And to provide a micro grid operating method capable of increasing the efficiency of management.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to solve such a problem, a micro grid operating method according to an embodiment of the present invention includes: measuring power generation amount of at least one generator for generating electricity connected to a micro grid; Acquiring data on a demand pattern, acquiring data on an electricity charge imposed on a time slot during a grid operation of the micro grid, and calculating, based on the electricity generation amount, the electric power demand pattern, And determining whether the electricity generated by the generator is used, sold, and stored.

The step of determining whether the electricity generated by the generator is used, sold, or stored may include an electric load consuming the generated electricity, an energy storage (ESS) connected to the generator to charge and discharge electricity, And determining which of the electricity markets that are connected to the microgrid to sell electricity will deliver the produced electricity.

The step of determining whether the electricity generated by the generator is used, sold, or stored may include transmitting electricity corresponding to an electricity usage amount of the electric load to the electric load when the produced electricity is used, Determining whether to store in the energy storage device (ESS), or to sell to the power market, the remaining amount minus the electricity usage amount in the electricity generation amount.

In addition, the step of determining whether to store the remaining amount in the energy storage device (ESS) or to sell it in the electric power market comprises: if the remaining amount of electricity is sold to the electric power market, Transmitting information to participate in the bidding, and displaying the amount of charge of the energy storage device (ESS) to the user when the electricity of the remaining amount is stored in the energy storage device (ESS).

The step of determining whether the electricity generated by the generator is used, sold, and stored may include the steps of: when the generated electricity is sold to the electric power market, And displaying the charged amount of the energy storage device (ESS) to the user when the generated electricity is stored in the energy storage device (ESS).

In addition, the at least one generator may generate electricity using any one of solar light, wind power, fire extinguishing gas, and small power.

A method of operating a micro grid according to another embodiment of the present invention includes the steps of measuring an amount of power generated by at least one generator for generating electricity connected to a micro grid, acquiring a power demand pattern of an electric load connected to the micro grid, Acquiring data related to an electricity charge imposed on a time basis during a grid operation of the microgrid; and controlling the energy storage device connected to the at least one generator based on the power generation amount, the power demand pattern, (ESS). ≪ / RTI >

Determining whether to use electricity generated by the at least one generator in the electric load based on the generated amount, the usage pattern, and the electricity rate; and determining whether the generated amount, the usage pattern, Determining whether to sell electricity generated by the at least one generator to a power market connected to the microgrid based on the fee.

In addition, the step of determining the operation mode of the energy storage device (ESS) may include determining whether an electric charge for the electric power consumption of the electric load at a specific time during the grid operation of the micro grid is greater than or equal to the electric power generation amount Charging the energy storage device (ESS) if the sum of the electric charge for the electric power and the electric charge for the electric power market is greater than the sum of the electric charge for the electric load for the specific time And discharging the energy storage device (ESS) if the sum is less than the sum of the electricity rate for the power generation and the electricity rate in the power market.

The determining of the operation mode of the energy storage device ESS may include charging the energy storage device ESS when the power consumption of the electric load is smaller than the power generation amount during independent operation of the micro grid, And discharging the energy storage device (ESS) if the power usage of the electric load is greater than the power generation amount.

In addition, the at least one generator may generate electricity using any one of solar light, wind power, fire extinguishing gas, and small power.

The micro grid operating method of the present invention can maximize the efficiency of micro grid operation and reduce the operating cost by judging whether the electricity generated by at least one generator is used, sold and stored. That is, it is possible to centrally monitor and control the state of each component for the water operation, so that the convenience of the user's management can be enhanced, the self-produced electricity can be operated, and the surplus electricity can be stored or sold. The maintenance cost of the system can be reduced.

In addition, the micro grid operating method of the present invention can load-level the power load applied to a business site and optimize the operation of the generator using the optimum power unit price through an optimal power trading bidding system linked with the load prediction The efficiency of energy can be improved.

In addition, the micro grid operating method of the present invention can operate by establishing ESS charge / discharge scheduling based on water demand prediction and load prediction, The electricity generated can be efficiently used, stored, and sold to maximize the profit of the establishment.

1 is a flowchart showing a water management system used in a conventional waterworks establishment.
2 is a block diagram illustrating a microgrid in accordance with some embodiments of the present invention.
3 is a graph illustrating an operation schedule of a renewable generator connected to a micro grid according to some embodiments of the present invention.
FIG. 4 is a graph showing an operation schedule of a renewable generator in independent operation of a micro grid according to some embodiments of the present invention. FIG.
FIG. 5 is a graph showing an operation schedule of a new-generation generator in a microgrid system operation according to some embodiments of the present invention. FIG.
6 and 7 are flowcharts illustrating a micro grid operating method according to an embodiment of the present invention.
8 and 9 are flowcharts illustrating a micro grid operating method according to another embodiment of the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

Hereinafter, a method of operating a micro grid and a micro grid according to some embodiments of the present invention will be described with reference to FIGS. 2 to 9. FIG.

2 is a block diagram illustrating a microgrid in accordance with some embodiments of the present invention.

Microgrids are small scale distributed power and load assemblies that can be operated in conjunction with or separate from conventional power grids. The microgrid represents a power system capable of maintaining a constant power supply to the load connected to the microgrid by using only the distributed power source, disconnected from the main system in the event of a major / minor fault and serious power quality problems.

Referring to FIG. 2, a microgrid according to some embodiments of the present invention includes an upper application 100, a SCADA platform 200, and a lower controller 300.

The upper application 100 can control the lower controller 300 through the SCADA platform 200. [

Specifically, the upper application 100 may include a number operating application 110, a power operation application 120, and a power trading application 130. [

The water management application 110 can comprehensively predict and control the number of establishments connected to the micro grid.

In particular, the water management application 110 may be configured to perform water capacity prediction functions (e.g., reservoir, demand node, block node prediction), water pump power optimal operation function considering power peak, A water treatment process control and scheduling function, and a sewage treatment process control and scheduling function. However, these functions are only a few examples, and the present invention is not limited thereto. In addition, since the above-described functions can be easily performed by a person skilled in the art, a detailed description will be omitted.

The power management application 120 can predict and control the power operations of the establishment connected to the microgrid.

Specifically, the power management application 120 can be used to predict renewable energy (solar power, wind power, small hydro power, fire extinguishing gas, etc.) generation, solar power generation prediction model and control technology, wind power generation prediction model and control technology, And the energy storage device 410 using the operation control model of the energy storage device 410 (ESS), which is a model of the power load prediction model and control technology, (Peak prevention) function, and an energy storage device 410 (Energy Shifting Control) function. However, this is merely an example, and the present invention is not limited thereto. In addition, since the above-described functions can be easily performed by a person skilled in the art, a detailed description will be omitted.

In the case of the power trading application 130, it is possible to sell the electricity produced in the establishment to the power market connected with the microgrid, or purchase electricity in the power market.

Specifically, the power trading application 130 is configured to include a power bidding function that integrates a load prediction model and a power generation prediction model, an optimal power trading market (power, REC, CO2) bidding system linkage function, A transaction decision model, and a reserve trading market participation model. However, these functions are only a few examples, and the present invention is not limited thereto. In addition, since the above-described functions can be easily performed by a person skilled in the art, a detailed description will be omitted.

The SCADA platform 200 can use the analog or digital signals on the communication path to collect, receive, record and display status information data of the remote device to the remote terminal so that the central control system can monitor and control the remote device.

Specifically, the SCADA platform 200 transmits information collected by the lower controller 300 to the upper application 100 and controls the lower controller 300 using the control signal generated by the upper application 100 have.

The SCADA platform 200 may include an integrated database server 210, an integrated management system 220, and an integrated Operator Station (IOS) 230.

The integrated database server 210 may collect and store the data collected from the lower controller 300 and the control commands of the upper application 100.

The integrated management system 220 may include a real-time monitoring and control function of various devices connected to the micro-grid, a data communication function associated with the integrated database server 210, various terminal devices (for example, PLC, DCS, RTU, etc.). However, these functions are only a few examples, and the present invention is not limited thereto. In addition, since the above-described functions can be easily performed by a person skilled in the art, a detailed description will be omitted.

The sub-controller 300 includes various terminals connected to the micro-grid. Specifically, the lower controller 300 includes an RCS (Remote Control Station) connected to various pumps and valves, a CCS (Central Control Station) for controlling the RCS, various flow meters, And may include an RTU (Remote Terminal Unit) connected to a pressure meter, a level meter, a water quality gauge, and an OS (Operator Station) for controlling the RTU. However, this is merely an example, and the present invention is not limited thereto.

The microgrid performs data communication between each component using wireless or wired communication.

Specifically, the communication protocol used by the micro grid of the present invention includes, for example, CDMA (Code Division Multiple Access) communication, WCDMA (Wideband Code Division Multiple Access) communication, or broadband wireless communication. In this case, the wireless communication network includes a wireless LAN (WLAN), a Wi-Fi, a wireless broadband (Wibro), a WiMAX (World Interoperability for WIMAX), a High Speed Downlink Packet Access (HSDPA) (IEEE 802.16), Wireless Mobile Broadband Service (WMBS), RS 485, CAN, Transmission Control Protocol (TCP) / Internet Protocol (UDP), User Datagram Protocol ), And the like.

In addition, the short-range wireless communication network used by the micro-grid includes Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, ), And the like. However, the present invention is not limited thereto.

The microgrid can also be connected to the energy storage device 410 and the one or more generators 420 to control the electricity production and to operate and manage the electricity produced.

The energy storage device 410 may store the electricity produced by the generator 420 and provide the stored electricity to the microgrid. The energy storage device 410 may include a plurality of batteries and a controller.

Specifically, the energy storage device 410 is a system for storing the generated power in each linkage system including a power plant, a substation, and a transmission line, and then using the power selectively and efficiently at a required time to enhance energy efficiency.

The energy storage device 410 can lower the power generation cost when the overall load ratio is improved by leveling the electric load with a large variation in time and season, and can reduce the investment cost and the operation cost required for the electric power facility expansion, Energy can be saved.

The generator 420 can generate electricity using a variety of energy sources. The generator 420 can generate electricity using renewable energy. Specifically, the generator 420 can generate electricity using various renewable energy such as sunlight, small hydro power, wind power, and extinguishing gas.

The present invention can increase the energy self-sustaining rate by constructing a conventional office as one micro grid.

Specifically, the microgrid of the present invention performs electric power generation scheduling using renewable energy such as sunlight, wind power, small hydro power, etc. in addition to prediction of water demand and electric load prediction, and at the same time, utilizes energy storage device 410 The power load can be leveled (Load Leveling) by shaving the power peak of the business establishment.

In addition, the micro grid of the present invention can save energy by optimally operating the water pump using the optimal power unit cost through the optimal power trading bidding system linked with the load prediction. In addition, the charge / discharge scheduling of the energy storage device 410 is established and operated based on the water demand prediction and the load prediction, so that it is possible to decide whether or not to interwork with the system.

Hereinafter, a method of operating the micro grid using the power generated by the new and renewable energy in the business office and the power trading will be described in detail in a business establishment connected to the generator 420 and the energy storage device 410 using the renewable energy.

3 is a graph illustrating an operation schedule of a renewable generator connected to a micro grid according to some embodiments of the present invention.

Referring to FIG. 3, FIG. 3 is a graph illustrating the amount of power generated by solar power generation, wind power generation, digestion gas power generation, and small hydro power generation, and the amount of water used by a user in a plurality of generators.

In a plurality of generators, electricity is produced in different patterns for each time zone. For example, in the case of photovoltaic power generation, the generation amount tends to concentrate in the daytime, and in the case of small hydro power generation, the power generation amount tends to be concentrated at a time when the user's water usage is high. That is, in the case of small hydropower generation, the graph shows that the water use amount and the high correlation coefficient are shown.

FIG. 4 is a graph showing an operation schedule of a renewable generator in independent operation of a micro grid according to some embodiments of the present invention. FIG.

Referring to FIG. 4, the operation schedule of the renewable generator at the independent operation of the micro grid is substantially the same as that of the plurality of generators shown in FIG. However, in FIG. 4, the electric power consumption in the electric load connected to the micro-grid is added.

FIG. 4 shows the operation state of the energy storage device (ESS) when the microgrid according to the present invention operates independently.

The usage pattern of the electric load is different according to the time of day, and the energy storage device (ESS) operates with different operation mode according to the time zone in order to supply electricity corresponding to the electric power consumption of the electric load.

For example, if the amount of power used in the electrical load is greater than the total amount of power produced by the plurality of generators, the energy storage device (ESS) may be operated in a discharge mode that provides stored electricity. Conversely, if the amount of power used in the electrical load is less than the total amount of power produced by the plurality of generators, the energy storage device (ESS) may be operated in a charging mode to store the remaining electricity.

However, this is an example, and a detailed description thereof will be described later.

FIG. 5 is a graph showing an operation schedule of a new-generation generator in a microgrid system operation according to some embodiments of the present invention. FIG.

Referring to FIG. 5, FIG. 5 shows an operating state of an energy storage device (ESS) in the case where the microgrid of the present invention is in a grid operation.

Here, the grid operation is a mode that operates using electricity applied from another power system. For example, during the grid operation, the business can operate using electricity provided by KEPCO.

At this time, electricity provided by another power system may be charged at different times and seasonally. For example, electricity provided by KEPCO can be charged at different rates based on the power consumption of users divided into light load periods, heavy load periods, and peak load periods.

Specifically, referring to FIG. 5, the t1 section and the t5 section correspond to the light load section, the t2 section and the t4 section correspond to the heavy load section, and the t3 section corresponds to the maximum load section. At this time, the electricity rate may be lowered in the order of the maximum load section, the heavy load section, and the light load section.

The micro grid of the present invention judges whether or not the electricity generated by the generator is used, sold, or stored based on the electricity generation amount generated by a plurality of generators, the user's electric power demand pattern, can do.

Specifically, the micro grid is associated with the electric power market, so that when the energy storage device (ESS) is charged, the electric charge is bidded and charged at a low-cost light load section, and the energy storage device (ESS) It is possible to judge whether it is economical to discharge or whether it is economical to sell electricity to the electric power market.

At this time, the objective function is to minimize the total electricity usage fee (eg, process operation + renewable power generation + electricity market bidding) of the workplace.

To this end, the microgrid of the present invention determines whether to generate electricity generated by a generator at a business establishment, in a power market, or in an energy storage device (ESS).

Hereinafter, a method of operating a micro grid according to some embodiments of the present invention will be described in detail.

6 and 7 are flowcharts illustrating a micro grid operating method according to an embodiment of the present invention.

Referring to FIG. 6, first, the power generation amount of at least one generator that generates electricity connected to the micro grid is measured (S110). For example, the Micro Grid can measure the generation of each of the solar power generators, small hydropower generators, wind power generators, and fire extinguisher generators that develop using environmentally friendly energy. However, the present invention is not limited thereto.

Subsequently, data on the power demand pattern of the electric load connected to the micro grid is obtained (S120). The power demand pattern can be the power demand of the user or the power demand needed to operate the establishment, or it can be a total of them.

Subsequently, at the time of system operation of the microgrid, data relating to the electricity rate charged for each time slot is acquired (S130). The electricity bill may be charged differently depending on the time period during which electricity is supplied from the system connected to the micro grid. For example, as described with reference to FIG. 5, different rates may be charged for the light load period, the heavy load period, and the maximum load period for each time period.

Then, based on the power generation amount, the power demand pattern, and the electricity rate, it is determined whether the electricity generated by the generator is used, sold, and stored (S140). This determines which of the electrical loads consuming the produced electricity, the energy storage (ESS) connected to the generator and charging and discharging the electricity, and the electricity market connected to the micro grid to transfer the produced electricity .

If there is a large demand for electric power in the establishment, the microgrid transfers the generated electricity to the electric load and uses it first in the establishment (S150). Then, if there is a residual amount of electricity left to provide to the electrical load, it can be judged again whether to store the remaining amount in the energy storage device (ESS) or to trade in the electricity market. A detailed description thereof will be described with reference to FIG.

Alternatively, if electricity is required to be stored in the energy storage device (ESS) according to the scheduling, electricity is transmitted to the energy storage device (ESS) (S160) and the energy storage device (ESS) . At this time, the microgrid can display the charge amount of the energy storage device (ESS) to the user.

On the other hand, when selling the generated electricity to the electric power market, information on the amount of electric power generated in the electric power market is transmitted to participate in the bid (S170, S175). In other words, when electricity is traded in the electric power market, it is possible to carry out the transaction by sending information on the amount of electricity that can be traded to the electric power market.

Referring to FIG. 7, following step S150 of FIG. 6, when electricity generated by the generator is used, the micro grid transfers electricity corresponding to the electricity consumption of the electric load to the electric load (S210).

Subsequently, it is determined whether a remaining amount, which is obtained by subtracting the electricity usage amount of the electric load from the power generation amount of the generator, has occurred (S220).

Next, when electricity is generated in the remaining amount, it is determined whether to store the remaining amount in the energy storage device (ESS) or not (S230).

If the electricity of the remaining amount is stored in the energy storage device ESS, electricity is transmitted to the energy storage device ESS in step S240, and the energy storage device 410 is operated in the charge mode in step S245. At this time, the microgrid can display the charge amount of the energy storage device (ESS) to the user.

On the other hand, if the electricity of the remaining amount is to be sold to the electric power market, information on the electricity amount of the remaining electric power is transmitted to the electric power market to participate in the bid (S250, S255). In other words, when electricity is traded in the electric power market, it is possible to carry out the transaction by sending information on the amount of electricity that can be traded to the electric power market.

Accordingly, the micro grid operating method of the present invention can maximize the efficiency of micro grid operation and reduce the operating cost by judging whether the electricity generated by at least one generator is used, sold, and stored . That is, the micro-grid operating method of the present invention can save the maintenance cost of the system because it can operate as self-produced electricity and store or sell surplus electricity. In addition, the optimal power trading bidding system linked with the load prediction can improve the efficiency of energy through optimal operation of the generator by using the optimum power unit price.

In addition, the micro grid operating method of the present invention can operate by establishing ESS charge / discharge scheduling based on water demand prediction and load prediction, The electricity generated can be efficiently used, stored, and sold to maximize the profit of the establishment.

8 and 9 are flowcharts illustrating a micro grid operating method according to another embodiment of the present invention. For the sake of convenience of description, the same elements as those of the above-described embodiment will be described below with the exception of duplicate descriptions.

Referring to FIG. 8, first, the power generation amount of at least one generator for generating electricity connected to the micro grid is measured (S310). For example, the Micro Grid can measure the generation of each of the solar power generators, small hydropower generators, wind power generators, and fire extinguisher generators that develop using environmentally friendly energy. However, the present invention is not limited thereto.

Subsequently, data regarding a power demand pattern of the electric load connected to the micro grid is obtained (S320). The power demand pattern can be the power demand of the user or the power demand needed to operate the establishment, or it can be a total of them.

Subsequently, at the time of system operation of the microgrid, data regarding electricity charges charged for each time slot is acquired (S330). The electricity bill may be charged differently depending on the time period during which electricity is supplied from the system connected to the micro grid.

Subsequently, the microgrid determines an operation mode of the energy storage device (ESS) connected to the at least one generator based on the power generation amount, the power demand pattern, and the electricity cost (S340). The energy storage device (ESS) may operate in a charging mode to store electricity or a discharge mode to provide stored electricity to an external device. At this time, the microgrid can determine and schedule the most efficient operation mode of the energy storage device (ESS) based on the power generation amount, the power demand pattern, and the electricity charge.

The energy storage device (ESS) can change the operation mode judgment criterion according to whether the micro grid is operated in the system. For example, the operating mode judgment criterion when the micro grid is operating independently and the operating mode judgment criterion when the micro grid is operating in the grid may be different. A detailed description thereof will be given later with reference to Fig.

Next, it is determined whether the electricity generated by the generator is used or not, based on the generated power, the electric power demand pattern, and the electric charge (S350). This means to determine whether to deliver the produced electricity to either the electrical load consuming the produced electricity or the electricity market connected to the micro grid.

If there is a large demand for electric power in the establishment, the micro grid transfers the generated electricity to the electric load and uses it first in the establishment (S360).

Then, if there is a residual amount of electricity left to provide to the electrical load, it can be judged again whether to store the remaining amount in the energy storage device (ESS) or to trade in the electricity market. The detailed description thereof has been described with reference to FIG. 7, and therefore, it will be omitted.

On the other hand, when selling the generated electricity to the electric power market, information on the electric power of the generated electric power is transmitted to the electric power market to participate in the bid (S370, S375). In other words, when electricity is traded in the electric power market, it is possible to carry out the transaction by sending information on the amount of electricity that can be traded to the electric power market.

Referring to FIG. 9, FIG. 9 illustrates a method of determining the operation mode of the energy storage device (ESS) in step S340 of FIG.

First, it is determined whether the micro grid is connected to a power system to perform a grid operation (S410) and whether or not the grid grid is not connected to a power grid (S420).

Next, if the microgrid is operated independently, the microgrid determines whether the power consumption of the electric load is greater than the power generation amount (S430).

If the electric power consumption of the electric load is smaller than the electric power generation amount, the microgrid operates the energy storage device (ESS) in the charge mode and stores electricity in the energy storage device (ESS) (S450). At this time, the microgrid can display the charge amount of the energy storage device (ESS) to the user.

Alternatively, when the electric power consumption of the electric load is greater than the electric power generation amount, the microgrid operates the energy storage device (ESS) in a discharge mode, and transfers electricity stored in the energy storage device (ESS) to the micro grid ). At this time, the micro grid can use the electricity received or sell it to the electric power market. At this time, the microgrid can perform electricity trading by participating in the bidding by transmitting information on the amount of electricity available to the electric power market.

On the other hand, when the microgrid is in a grid operation, the microgrid calculates the electric charge for the electric power usage of the electric load at a certain time, the electric charge for the electric power generation at the specific time, (S440).

If the electric charge for the electric load of the electric load at the specific time, the electric charge for the electric power generation at the specific time and the electric charge for the electric market in the specific time, Mode, and stores electricity in the energy storage device (ESS) (S450). At this time, the microgrid can display the charge amount of the energy storage device (ESS) to the user.

Alternatively, if the electricity rate for the power usage of the electrical load at the specific time is less than the sum of the electricity rate for the power generation at the specific time and the electricity rate in the power market, The storage device ESS is operated in a discharge mode, and electricity stored in the energy storage device ESS is transmitted to the micro grid S460. At this time, the micro grid can use the electricity received or sell it to the electric power market. At this time, the microgrid can perform electricity trading by participating in the bidding by transmitting information on the amount of electricity available to the electric power market.

Accordingly, the micro grid operating method of the present invention can maximize the efficiency of micro grid operation and reduce the operating cost by judging whether the electricity generated by at least one generator is used, sold, and stored . That is, the micro-grid operating method of the present invention can save the maintenance cost of the system because it can operate as self-produced electricity and store or sell surplus electricity.

In addition, the micro grid operating method of the present invention can load-level the power load applied to a business site and optimize the operation of the generator using the optimum power unit price through an optimal power trading bidding system linked with the load prediction The efficiency of energy can be improved.

In addition, the micro grid operating method of the present invention can operate by establishing ESS charge / discharge scheduling based on water demand prediction and load prediction, The electricity generated can be efficiently used, stored, and sold to maximize the profit of the establishment.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

Claims (11)

Measuring the power generation amount of at least one generator for generating electricity connected to the micro grid;
Obtaining data on a power demand pattern of an electrical load connected to the microgrid;
Acquiring data related to an electricity rate to be imposed on a time slot during a grid operation of the micro grid; And
And determining whether to use, sell, and store electricity generated by the generator based on the power generation amount, the power demand pattern, and the electricity charge
How to operate Micro Grid.
The method according to claim 1,
The step of determining whether to use, sell, or store electricity generated by the generator includes:
An electric energy storage device (ESS) connected to the generator to charge and discharge electricity, and a power market connected to the micro grid to transfer electricity to the electric power market. Lt; RTI ID = 0.0 >
How to operate Micro Grid.
3. The method of claim 2,
The step of determining whether to use, sell, or store electricity generated by the generator includes:
When the generated electricity is used, electricity corresponding to the electricity usage amount of the electric load is transmitted to the electric load,
Determining whether to store, in the energy storage device (ESS), the remaining amount obtained by subtracting the electricity use amount from the electricity generation amount,
How to operate Micro Grid.
The method of claim 3,
Wherein the step of determining whether to store the remaining amount in the energy storage device (ESS)
If the remaining amount of electricity is sold to the electric power market, information on the remaining electric power amount is transmitted to the electric power market to participate in the bid;
Displaying the amount of charge of the energy storage device (ESS) to the user when storing the electricity of the remaining amount in the energy storage device (ESS)
How to operate Micro Grid.
3. The method of claim 2,
The step of determining whether to use, sell, or store electricity generated by the generator includes:
And when the generated electricity is sold to the electric power market, information on the electric power amount of the produced electric power is transmitted to the electric power market to participate in the bid,
And displaying a charge amount of the energy storage device (ESS) to a user when storing the produced electricity in the energy storage device (ESS)
How to operate Micro Grid.
The method according to claim 1,
Wherein the at least one generator generates electricity using either solar light, wind power, extinguishing gas, or small power
How to operate Micro Grid.
Measuring an amount of electricity generated in at least one generator that produces electricity connected to the microgrid;
Obtaining a power demand pattern of an electrical load connected to the micro grid;
Acquiring data related to an electricity rate to be imposed on a time slot during a grid operation of the micro grid; And
Determining an operating mode of an energy storage device (ESS) coupled to the at least one generator based on the power generation amount, the power demand pattern, and the electricity charge,
How to operate Micro Grid.
8. The method of claim 7,
Determining whether to use electricity generated by the at least one generator in the electric load based on the generated amount, the electric power demand pattern, and the electric charge;
Determining whether to sell electricity produced by said at least one generator to a power market connected to said micro grid, based on said power generation amount, said power demand pattern and said electricity bill,
How to operate Micro Grid.
8. The method of claim 7,
Wherein determining the operating mode of the energy storage device (ESS)
When the electric charge for the electric power consumption of the electric load at the specific time during the grid operation of the micro grid is larger than the electric charge for the electricity generation amount at the specific time and the electric charge at the electric power market at the specific time, The storage device (ESS) is charged,
(ESS) if the electricity rate for the electric power usage of the electric load at the specific time is less than the sum of the electricity rate for the generation amount at the specific time and the electricity rate in the electricity market. Including discharging
How to operate Micro Grid.
8. The method of claim 7,
Wherein determining the operating mode of the energy storage device (ESS)
Wherein when the power consumption of the electric load is smaller than the power generation amount during the independent operation of the micro grid, the energy storage device (ESS)
And discharging the energy storage device (ESS) if the power usage of the electric load is greater than the power generation amount
How to operate Micro Grid.
8. The method of claim 7,
Wherein the at least one generator generates electricity using either solar light, wind power, extinguishing gas, or small power
How to operate Micro Grid.

Images