KR102643132B1 - Method for evaluating islanding operation sustainability of small scaled power system and apparatus thereof - Google Patents

Abstract

The present invention relates to a method for evaluating the independent operation maintenance ability of a power system that can be linked to a higher power power system, comprising: when selecting an independent operation event, reconfiguring the power system according to the selected independent operation event; collecting independent operation data related to distributed resources of the reconfigured power system; Simulating independent operation of the reconfigured power system based on the collected independent operation data; and evaluating the independent operation maintenance ability of the reconfigured power system based on the independent operation simulation results.

Description

Method and device for evaluating independent operation maintenance of small power system {METHOD FOR EVALUATING ISLANDING OPERATION SUSTAINABILITY OF SMALL SCALED POWER SYSTEM AND APPARATUS THEREOF}

The present invention relates to a method and device for evaluating the independent operation maintenance ability of a small power system, and more specifically, to the ability of the power system to maintain power supply to the system load until the power recovery time when an independent operation event occurs or is selected. It relates to a method and device for evaluating .

Currently, the power industry's paradigm is changing from the method of transmitting power produced through large-scale power plants to the ultra-high voltage power grid, which was promoted in the past industrialization era, to a small-scale power generation method using distributed resources. Accordingly, smart-grids are emerging to reduce centralized large-scale fossil fuel power generation and expand new renewable energy, and research on small-scale distributed power generation systems based on renewable energy is actively underway. there is. In particular, distributed power generation systems in islands and mountainous areas not only promote the use of new and renewable energy, but also greatly reduce the cost burden of power generation facilities.

The most representative example of such small-scale distributed power generation systems is the Micro-Grid system. Unlike existing centralized power supply systems, the microgrid system is a local power supply system consisting of distributed power sources including new renewable energy sources and energy storage devices, and can be divided into grid-connected and independent types. The grid-connected microgrid system is an AC microgrid system that is connected to the power system based on AC power, and a DC microgrid system that is connected to the power system based on DC power. It can be classified as:

In the case of a grid-connected microgrid system, when an independent operation event such as a power outage occurs in the power system connected to the system, the microgrid system is automatically disconnected from the power system and uses the distributed power sources of the system until power recovery. The power produced through the system is provided to consumer loads.

When such an independent operation situation occurs, there is a problem in which the system operator cannot efficiently operate the microgrid system because it is difficult to predict the time that the microgrid system can maintain independent operation using its distributed power sources. Therefore, when an independent operation event occurs or is selected, there is a need to automatically evaluate the independent operation maintenance ability of the microgrid system and provide it to the system operator. In particular, there is a great need to evaluate the ability to maintain independent operation and provide it to system operators for microgrid systems located in areas where power outages are likely to occur due to geographical or environmental influences, or where the power system itself is not robust.

The present invention aims to solve the above-mentioned problems and other problems. Another purpose is to provide a method and device for automatically evaluating the ability of a small power system to maintain power supply to the system load using distributed power sources at the time of occurrence of an independent operation event when an independent operation event occurs or is selected. In providing.

According to one aspect of the present invention to achieve the above or other objects, when an independent operation event is selected, reconfiguring the power system according to the selected independent operation event; collecting independent operation data related to distributed resources of the reconfigured power system; Simulating independent operation of the reconfigured power system based on the collected independent operation data; and evaluating the independent operation maintenance ability of the reconfigured power system based on the independent operation simulation results.

According to another aspect of the present invention, when an independent operation event is selected, an independent operation system component that reconfigures the power system according to the selected independent operation event; an independent operation data collection unit that collects independent operation data related to distributed resources of the power system reconfigured through the independent operation system component; an independent operation simulation operation unit that simulates the independent operation of the reconfigured power system based on the independent operation data collected through the independent operation data collection unit; and an independent operation maintenance ability evaluation unit that evaluates the independent operation maintenance ability of the reconfigured power system based on the results of the independent operation simulation through the independent operation simulation operation unit. An independent operation maintenance ability evaluation device of a power system that can be linked to a higher power system. provides.

According to another aspect of the present invention, when an independent operation event is selected, the process of reconfiguring the power system according to the selected independent operation event; A process of collecting independent operation data related to distributed resources of the reconfigured power system; A process of simulating independent operation of the reconfigured power system based on the collected independent operation data; and a computer program stored in a computer-readable recording medium so that a process of evaluating the independent operation maintenance ability of the reconfigured power system is sequentially performed on a computer based on the independent operation simulation results.

The method for evaluating the independent operation maintenance ability of a small-scale power system and the effects of the device according to embodiments of the present invention will be described as follows.

According to at least one of the embodiments of the present invention, when an independent operation event occurs in a small power system located in an area where there is a high probability of a power outage or an area where the power system is not robust, the power system is connected to the system load until power recovery time. It has the advantage of automatically evaluating the ability to maintain power supply and providing it to the system operator, allowing the system operator to efficiently perform distributed resource operation and power operation of the power system.

However, the effects that can be achieved by the method for evaluating the independent operation maintenance of a small power system and the device according to the embodiments of the present invention are not limited to those mentioned above, and other effects not mentioned can be seen from the description below. It will be clearly understandable to those skilled in the art to which the invention belongs.

1 is an overall configuration diagram of a small-scale power system according to an embodiment of the present invention;
Figure 2 is a block diagram of an independent operation maintenance force evaluation device according to an embodiment of the present invention;
Figure 3 is a flowchart illustrating a method for evaluating independent driving maintenance ability according to an embodiment of the present invention;
Figure 4 is a diagram referenced to explain a method of selecting the cause of independent operation of a small power system;
Figure 5 is a diagram referenced to explain a method of reconfiguring a small-scale power system when selecting an independent operation cause;
Figure 6 is a diagram referenced to explain a method for simulating independent operation of a small-scale power system;
Figures 7 and 8 are flowcharts illustrating a method for evaluating the ability to maintain independent operation of a small power system.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted. The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves. That is, the term 'unit' used in the present invention refers to a hardware component such as software, FPGA, or ASIC, and the 'unit' performs certain roles. However, 'wealth' is not limited to software or hardware. The 'part' may be configured to reside on an addressable storage medium and may be configured to run on one or more processors. Therefore, as an example, 'part' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, procedures, Includes subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or may be further separated into additional components and 'parts'.

Additionally, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

The present invention provides a method and device for automatically evaluating the ability of a small power system to maintain power supply to the system load when an independent operation event occurs or is selected using distributed power sources at the time of the independent operation event. suggests. In the following specification, it is assumed that the present invention is applied to a small-scale power system (i.e., grid-connected microgrid system) connected to a higher power grid. However, the present invention can be applied not only to small-scale power systems consisting of alternating current or direct current power, but also to small-scale power systems that are not connected to the upper power system (i.e., stand-alone microgrid system).

The small-scale power system according to the present invention is basically composed of an operating system and distributed power sources and loads linked to the power system. The distributed power sources include, but are not necessarily limited to, new renewable energy sources that produce and/or output power, fuel cells, energy storage systems (ESS), and generators.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

1 is an overall configuration diagram of a small-scale power system according to an embodiment of the present invention.

Referring to FIG. 1, a small-scale power system 100 according to an embodiment of the present invention includes an operating system 110, a wind power generation system 120, a solar power generation system 130, an emergency generator 140, and energy storage. It may include a device 150 and a load 160. Hereinafter, the small-scale power system 100 described in this specification is a concept including a microgrid system.

The small-scale power system 100 is operated by connecting a wind power generation system 120, a solar power generation system 130, an emergency generator 140, an energy storage device 150, and a load 160 to the grid line 170. As a small-scale power grid, it can be connected to the upper power system (20) through the grid connection point (10). Accordingly, the small-scale power system 100 can receive power from the upper power system 20 or supply power to the upper power system 20 depending on the power supply and demand status.

The operating system 110 is connected to a plurality of distributed resources 120 to 160 constituting the power system 100 through a communication line 180 and can predict the operating status of the distributed resources 120 to 160. For example, the operating system 110 can predict the power generation pattern of the new renewable energy sources 120 and 130 by time period and the power consumption pattern of the load 160 by time period.

The operating system 110 is connected to a plurality of distributed resources 120 to 160 constituting the power system 100 through a communication line 180 to monitor the operating status of the distributed resources 120 to 160 or to monitor the operation status of the distributed resources 120 to 160. The operation of the distributed resources 120 to 160 can be remotely controlled. For example, the operating system 110 stabilizes the power system by monitoring and remotely controlling the operation of the wind power generation system 120, the solar power generation system 130, the emergency generator 140, and the energy storage device 150. And the small power system 100 can be operated efficiently.

The operating system 110 is connected to the system connection point 10 and the communication line 180 and can obtain information about the connection point between the power system 100 and the upper power system 20 in real time. Information regarding the connection point includes, but is not necessarily limited to, voltage change information, voltage/current waveform information, voltage imbalance information, voltage phase information, power factor information, and frequency information.

When an independent operation event occurs or is selected, the operating system 110 supplies power to the system load 160 based on the distributed power sources 120 to 150 at the time of the independent operation event. The ability to maintain can be automatically evaluated and provided to the system operator.

The wind power generation system 120 is a new renewable energy source and can produce power using wind power. Power produced through the wind power generation system 120 may be stored in the energy storage device 150 or supplied to the load 160 through the grid line 170 of the power system 100.

The solar power generation system 130 is a new renewable energy source and can produce electricity using solar power. Likewise, the power produced through the solar power generation system 130 may be stored in the energy storage device 150 or supplied to the load 160 through the grid line 170 of the power system 100.

The emergency generator 140 is a type of diesel generator and can produce power using diesel fuel. Likewise, the power produced through the emergency generator 140 may be stored in the energy storage device 150 or supplied to the load 160 through the grid line 170 of the power system 100.

Energy storage device (ESS, 150) refers to any device that stores power and makes it available when needed. This energy storage device 150 may perform the function of stabilizing irregular power generated through new renewable energy sources such as the wind power generation system 120 or the solar power generation system 130. In addition, the energy storage device 150 stores power during times other than peak power use times and uses the stored power during peak power use times, thereby performing the function of minimizing expensive peak power demand. .

The energy storage device 150 can be charged by receiving power from the power system 170 according to the control command of the battery management system (BMS) in the operating system 110, and uses the power stored inside. It can be discharged by providing it to the power system 170.

The load 160 is a load located at the customer of the small power system 100 and may be any electronic device that consumes power output from the distributed power sources 120 to 150 of the power system 100. Additionally, the load 160 may be any electronic device that consumes power supplied from the upper power system 20.

Figure 2 is a block diagram of an independent operation maintenance force evaluation device according to an embodiment of the present invention.

Referring to Figure 2, the independent operation maintenance force evaluation device 200 according to an embodiment of the present invention includes an input unit 210, an output unit 220, a communication unit 230, a database 240, and an independent operation system component ( 250), an independent operation data collection unit 260, a power supply and demand simulation operation unit 270, and an independent operation maintenance capability evaluation unit 280. The components shown in FIG. 2 are not essential for implementing the independent operation maintenance force evaluation device, so the independent operation maintenance force evaluation device described herein may have more or less components than the components listed above. . Additionally, the independent operation maintenance evaluation device 210 may be installed within the operating system 110 of FIG. 1 or may be implemented as a separate independent device.

The input unit 210 includes a camera or video input unit for inputting video signals, a microphone or audio input unit for inputting audio signals, and a user input unit (for example, a touch key, a push key (mechanical device)) for receiving information from the user. key), etc.) may be included. In this embodiment, the input unit 210 may receive user input related to evaluation of the independent operation maintenance ability of a small power system. For example, the system operator can select, through the input unit 210, the type (or type) of an independent operation event that has a high probability of occurring in the relevant power system or the type of independent operation event for which the independent operation maintenance ability of the relevant power system is to be evaluated. . Here, the type of independent operation event corresponds to the cause of independent operation of a small power system.

The output unit 220 is a display unit and displays (outputs) information processed by the independent driving maintenance evaluation device 200. For example, the output unit 220 displays execution screen information of an application program running on the independent operation maintenance evaluation device 200, or UI (User Interface) and GUI (Graphic User Interface) information according to this execution screen information. can do.

The communication unit 220 may include a wired communication module to support a wired network and a wireless communication module to support a wireless network. The wired communication module operates on a wired communication network built according to technical standards or communication methods for wired communication (e.g., Ethernet, PLC (Power Line Communication), Home PNA, IEEE 1394, etc.). Transmits and receives wired signals with at least one of an external server and other power devices. The wireless communication module uses technical standards or communication methods for wireless communication (e.g., WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), DLNA (Digital Living Network Alliance), GSM (Global System for Mobile communication) ), CDMA (Code Division Multi Access), WCDMA (Wideband CDMA), LTE (Long Term Evolution), LTE-A (Long Term Evolution-Advanced), etc.) on a wireless communication network constructed in accordance with at least a base station, Access Point, and repeater. Send and receive wireless signals with one.

In this embodiment, the communication unit 220 may exchange data with distributed resources constituting a small-scale power system using at least one of a wired communication module and a wireless communication module.

The database (or memory, 240) stores data supporting various functions of the independent operation maintenance evaluation device 200. The database 240 may store an application program (application program or application) running on the independent operation maintenance force evaluation device 200, data for operation of the independent operation maintenance force evaluation device 200, and commands. In particular, in this embodiment, the database 240 may store data necessary for simulating power supply and demand of a small-scale power system.

When the system operator selects the independent operation cause, the independent operation system component 250 may detect information about distributed resources corresponding to the selected independent operation cause from the database 240. At this time, the database 240 pre-stores information on the types of distributed resources according to the cause of independent operation in the form of a look-up table.

The independent operation system configuration unit 250 may configure a power system that excludes distributed resources corresponding to the cause of independent operation selected by the system operator and includes only distributed resources capable of independent operation.

The independent operation data collection unit 260 may collect independent operation data necessary for a simulated operation of power supply and demand of the power system reconfigured through the independent operation system configuration unit 250. That is, the independent operation data collection unit 260 can collect data about distributed resources that make up the corresponding power system. At this time, the independent operation data includes load prediction data for each schedule cycle of consumer load, output amount prediction data for each schedule cycle of new renewable energy sources, PCS (Power Conversion System) output rating of the energy storage device, battery capacity, and battery charge state. of Charge (SOC), data on the output rating and current remaining fuel amount of the emergency generator, data on the output rating and current remaining fuel amount of the fuel cell, etc.

The independent operation data collection unit 260 may store the collected independent operation data in the database 240. The independent operation data stored in the database 240 can be used in a power supply and demand simulation operation to evaluate the ability to maintain independent operation of a small power system.

The power supply and demand simulation operation unit (or the independent operation simulation operation unit, 270) can virtually simulate the independent operation of the power system based on the independent operation data stored in the database 240. At this time, the power supply and demand simulation operation unit 270 may simulate the distributed power sources to satisfy the power supply and demand between the distributed power sources and the load constituting the power system. Additionally, the power supply and demand simulation operation unit 270 may only consider the supply and demand of effective power of the corresponding power system.

When simulating the independent operation of the power system, the power supply and demand simulation operation unit 270 may simulate and operate the distributed power sources so that the total operating cost of the distributed power sources capable of supplying power to the load is minimized. Since there is a limit to the supply capacity of the distributed power sources that make up the power system, the power supply capacity to the load varies depending on the power recovery (expected) time of the power system.

The independent operation maintenance capability evaluation unit 280 may evaluate the independent operation maintenance capability of the power system based on the independent operation simulation results (or power supply and demand simulation operation results) of the power system. Here, the ability to maintain independent operation of the power system can be defined as the ability to supply power to the load of the power system.

As a method to objectively evaluate the independent operation maintenance ability of the corresponding power system, the independent operation maintenance ability evaluation unit 280 may calculate the independent operation maintenance ability index of the corresponding power system. The independent operation maintenance capability index is the total amount of power that can be supplied by the distributed power sources of the power system up to a preset recovery time divided by the total amount of load power.

In addition, as a method to objectively evaluate the independent operation maintenance ability of the power system, the independent operation maintenance ability evaluation unit 280 determines the power supply and demand of the power system at regular intervals until the power recovery time and determines the power supply and demand of the power system. The time for full supply can be calculated. That is, the power supply and demand simulation operation unit 270 can calculate the point in time when the power supply and demand of the power system is broken by comparing the amount of power that can be supplied by the distributed power sources and the amount of load power at regular intervals until the power recovery time.

As described above, the independent operation maintenance evaluation device according to the present invention assumes that various types of independent operation events occur in a small power system linked to the upper power system, and the power system provides power to the system load until the power recovery time. The ability to maintain supply can be automatically assessed.

Figure 3 is a flowchart explaining a method for evaluating independent driving maintenance ability according to an embodiment of the present invention.

Referring to FIG. 3, the independent operation maintenance ability evaluation device 200 according to the present invention is a program (hereinafter, the description of For convenience, the program (referred to as 'independent driving maintenance evaluation program') can be executed and the execution screen of the program can be displayed on the display unit.

The system operator can operate the independent operation maintenance evaluation device 200 to select the type of independent operation event with a high probability of occurring in the power system or the type of independent operation event for which the independent operation maintenance ability of the power system is to be evaluated ( S310). Here, the type of independent operation event corresponds to the cause of independent operation of a small power system.

For example, as shown in FIG. 4, the system operator operates the independent operation maintenance evaluation device 200 to determine the cause of the independent operation of the power system 400 by a power outage in the upper power system 20 and wind power generation. It can be selected (or set) to indicate that a problem has occurred in the system 120.

When the system operator selects the independent operation cause, the independent operation maintenance evaluation device 200 detects information about distributed resources corresponding to the selected independent operation cause, and determines independent operation based on the information about the detected distributed resources. A possible power system can be configured (S320).

In other words, the independent operation maintenance evaluation device 200 can exclude distributed resources corresponding to the cause of independent operation selected by the system operator and reconfigure the power system to include only distributed resources capable of independent operation. For example, as shown in FIG. 5, the independent operation maintenance evaluation device 200 evaluates distributed resources 130 excluding the upper power system 20 and the wind power generation system 120 corresponding to the cause of the independent operation selected by the system operator. The power system 500 including ~160) can be reconfigured.

The independent operation maintenance evaluation device 200 may collect independent operation data necessary to simulate the independent operation of the reconfigured power system and store the collected independent operation data in a database (S330). At this time, the independent operation data includes load prediction data for each schedule cycle of consumer load, output volume prediction data for each schedule cycle of new renewable energy sources, PCS (Power Conversion System) rating of the energy storage device, battery capacity, and current charging state (State of Charge, SOC), output rating of the emergency generator, and data on the current remaining fuel amount.

The independent operation maintenance evaluation device 200 can virtually simulate independent operation to satisfy the power supply and demand of the corresponding power system based on independent operation data stored in the database (S340).

More specifically, when simulating the independent operation of a power system, the independent operation maintenance evaluation device 200 may operate the distributed power sources so that power supply and demand between the distributed power sources constituting the power system and the load are satisfied. In other words, the independent operation maintenance evaluation device 200 can operate the distributed power sources of the power system to satisfy Equation 1 below for each certain cycle until the power recovery time.

는 분산 전원들의 일정 주기 별 공급 전력량이고,

는 일정 주기 별 부하 전력량임.here,

is the amount of power supplied per schedule cycle of distributed power sources,

is the load power amount per schedule cycle.

)은 아래 수학식 2와 같이 정의될 수 있다.In Equation 1 above, the amount of power supplied per certain cycle of the distributed power sources that make up the power system (

) can be defined as Equation 2 below.

는 비상 발전기의 일정 주기 별 공급 전력량이고,

는 태양광 발전 시스템의 일정 주기 별 공급 전력량이고,

는 에너지 저장장치의 일정 주기 별 공급 전력량임.here,

is the amount of power supplied by the emergency generator for each certain cycle,

is the amount of power supplied per schedule cycle of the solar power generation system,

is the amount of power supplied per certain cycle of the energy storage device.

Additionally, when simulating the independent operation of a power system, the independent operation maintenance evaluation device 200 may operate the distributed power sources so that the total operating cost of the distributed power sources is minimized according to the optimal operation strategy of the power system. That is, the independent operation maintenance evaluation device 200 can operate the distributed power sources of the power system to satisfy Equation 3 below.

는 분산 전원들의 일정 주기 별 공급 전력량임.Here, f is the total operating cost function of the distributed power sources, n is the power recovery (expected) time, and i is the constant cycle that determines the power supply and demand of the power system.

is the amount of power supplied per schedule cycle of distributed power sources.

When simulating the independent operation of such a power system, there is a limit to the supply capacity of the emergency generator and energy storage device, so the power supply capacity to the load varies depending on the power recovery time of the power system. Here, the supply capacity limit of the emergency generator can be defined as Equation 4 below, and the supply capacity limit of the energy storage device can be defined as Equation 5 below.

For example, as shown in FIG. 6, when simulating the independent operation of the power system 500, the independent operation maintenance evaluation device 200 matches the amount of power supplied to the distributed power sources 130 to 150 for each certain period and the amount of load power. The distributed power sources 130 to 150 can be operated virtually to do so. Meanwhile, when an independent operation event of the power system 500 occurs, the fuel amount of the emergency generator 140 and the SOC status of the energy storage device 150 gradually decrease as time passes, thereby supplying power to the load 160. Capacity varies depending on the power recovery time of the power system 500.

The independent operation maintenance ability evaluation device 200 may evaluate the independent operation maintenance ability of the power system based on the independent operation simulation results for power supply and demand of the power system (S350). Here, the ability to maintain independent operation of the power system can be defined as the ability to supply power to the load of the power system.

)는, 아래 수학식 6과 같이, 해당 전력시스템의 분산 전원들이 미리 설정된 복전 시간까지 공급 가능한 전체 전력량을 전체 부하 전력량으로 나눈 값이다. As an example, the independent operation maintenance capability evaluation device 200 may calculate an independent operation maintenance capability index to objectively evaluate the independent operation maintenance capability of the corresponding power system. The independent driving maintenance ability index (

) is the total amount of power that can be supplied by the distributed power sources of the corresponding power system until the preset power recovery time divided by the total amount of load power, as shown in Equation 6 below.

는 복전 시간까지의 전체 공급 전력량이고,

는 복전 시간까지의 전체 부하 전력량이고, n은 복전 (예상) 시간이고, i는 전력시스템의 전력수급여부를 판단하는 일정 주기임.here,

is the total amount of power supplied until power recovery time,

is the total load power amount until the power recovery time, n is the power recovery (expected) time, and i is the constant cycle that determines the power supply and demand of the power system.

)를 산출할 수 있다(S730).More specifically, as shown in FIG. 7, the independent operation maintenance evaluation device 200 may receive an input of the expected power recovery time (n) of the corresponding power system from the system operator (S710). The independent operation maintenance evaluation device 200 may calculate the total amount of power supplied to the distributed power sources and the total amount of load power based on the results of simulating the independent operation of the power system until the expected power recovery time (n) (S720). The independent operation maintenance capability evaluation device 200 provides an independent operation maintenance capability evaluation index (

) can be calculated (S730).

Meanwhile, in another embodiment, the independent operation maintenance evaluation device 200 may calculate the power supply and demand maintenance time of the power system by determining whether or not power is supplied to the power system at regular intervals until the expected power recovery time.

More specifically, as shown in FIG. 8, the independent operation maintenance evaluation device 200 may receive the expected power recovery time (n) of the corresponding power system from the system operator (S810). The independent operation maintenance evaluation device 200 may set a certain time period (i) to periodically determine the power supply and demand of the corresponding power system until the expected power recovery time (n) (S820). Thereafter, the independent operation maintenance evaluation device 200 may calculate the amount of power supplied and the amount of load power of the distributed power sources for each certain time period based on the results of the simulation of the independent operation of the power system (S830). The independent operation maintenance power evaluation device 200 may compare the amount of power supplied by the distributed power sources and the amount of load power at certain time periods to determine whether or not power is supplied to the corresponding power system (S840).

As a result of the determination in step 840, if the power system satisfies the power supply and demand, the independent operation maintenance power evaluation device 200 sets the next time period (i+1) of the current time period (i) and then performs the above-described step 830. The operations of steps 840 and 840 may be performed repeatedly (S850). Meanwhile, as a result of the determination in step 840, if the power system does not satisfy power supply and demand, the independent operation maintenance evaluation device 200 may calculate the previous time period (i-1) of the current time period (i). (S860). Here, the detected previous time period (i-1) corresponds to the time during which the corresponding power system maintains power supply and demand.

As described above, the independent operation maintenance evaluation method according to the present invention assumes that various types of independent operation events occur in a small power system linked to the upper power system, and the power system responds to the system load until the power recovery time. The ability to maintain power supply can be automatically assessed.

The above-described present invention can be implemented as computer-readable code on a program-recorded medium. Computer-readable media includes all types of recording devices that store data that can be read by a computer system. Examples of computer-readable media include HDD (Hard Disk Drive), SSD (Solid State Disk), SDD (Silicon Disk Drive), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is. Accordingly, the above detailed description should not be construed as restrictive in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

100: Small power system 110: Operating system
120: wind power generation system 130: solar power generation system
140: emergency generator 150: energy storage device
160: load

Claims (11)

In the method of evaluating the independent operation maintenance ability of a power system that can be linked to a higher power power system,
When selecting an independent operation event, reconfiguring the power system according to the selected independent operation event;
collecting independent operation data related to distributed resources of the reconfigured power system;
Simulating independent operation of the reconfigured power system based on the collected independent operation data; and
Based on the independent operation simulation results, evaluating the independent operation maintenance ability of the reconfigured power system,
The evaluation step is an independent operation maintenance ability evaluation method characterized in that the independent operation maintenance ability index of the reconfigured power system is calculated. The method of claim 1, wherein the reconstructing step comprises:
A method for evaluating the maintenance of independent operation, characterized in that the distributed resource corresponding to the selected independent operation event is excluded from among the distributed resources constituting the power system. According to paragraph 1,
The independent operation data includes load prediction data for each schedule cycle, renewable power generation prediction data for each schedule cycle, PCS (Power Conversion System) output rating data, battery capacity data, battery SOC (State Of Charge) data, generator output rating data, An independent operation maintenance evaluation method comprising at least one of generator fuel amount data, fuel cell output rating data, and fuel cell fuel amount data. The method of claim 1, wherein the simulation step includes:
An independent operation maintenance evaluation method characterized by simulating operation of the distributed power sources to satisfy power supply and demand between the distributed power sources and loads of the reconfigured power system. The method of claim 4, wherein the simulation step includes:
A method for evaluating the ability of independent operation, characterized by simulating operation of the distributed power sources so that the total operating cost of the distributed power sources capable of supplying power to the load is minimized. delete According to paragraph 1,
An independent driving maintenance ability evaluation method, characterized in that the independent driving maintenance ability index is calculated through the equation below.
[Equation]

here,

is the total power supply of distributed power sources,

is the total load power amount of the consumer load, n is the expected power recovery time, and i is the constant cycle that determines the power supply and demand of the power system. In the method of evaluating the independent operation maintenance ability of a power system that can be linked to a higher power power system,
When selecting an independent operation event, reconfiguring the power system according to the selected independent operation event;
collecting independent operation data related to distributed resources of the reconfigured power system;
Simulating independent operation of the reconfigured power system based on the collected independent operation data; and
Based on the independent operation simulation results, evaluating the independent operation maintenance ability of the reconfigured power system,
The evaluation step is an independent operation maintenance evaluation method characterized in that the power supply and demand maintenance time of the power system is calculated by determining whether or not the power supply and demand of the reconfigured power system is supplied at regular intervals. A computer program stored in a computer-readable recording medium so that the method according to any one of claims 1 to 5, 7, and 8 is performed on a computer. In the independent operation maintenance evaluation device of a power system that can be linked to a higher power system,
When an independent operation event is selected, an independent operation system configuration unit that reconfigures the power system according to the selected independent operation event;
an independent operation data collection unit that collects independent operation data related to distributed resources of the power system reconfigured through the independent operation system component;
an independent operation simulation operation unit that simulates the independent operation of the reconfigured power system based on the independent operation data collected through the independent operation data collection unit; and
An independent operation maintenance capability evaluation unit that evaluates the independent operation maintenance capability of the reconfigured power system based on the independent operation simulation results through the independent operation simulation operation unit,
The independent operation maintenance capability evaluation unit is an independent operation maintenance capability evaluation device, wherein the independent operation maintenance capability index of the reconfigured power system is calculated. In the independent operation maintenance evaluation device of a power system that can be linked to a higher power system,
When an independent operation event is selected, an independent operation system configuration unit that reconfigures the power system according to the selected independent operation event;
an independent operation data collection unit that collects independent operation data related to distributed resources of the power system reconfigured through the independent operation system component;
an independent operation simulation operation unit that simulates the independent operation of the reconfigured power system based on the independent operation data collected through the independent operation data collection unit; and
An independent operation maintenance capability evaluation unit that evaluates the independent operation maintenance capability of the reconfigured power system based on the independent operation simulation results through the independent operation simulation operation unit,
The independent operation maintenance ability evaluation unit determines the power supply and demand of the reconfigured power system at a certain period and calculates the power supply and demand maintenance time of the power system.

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