KR-20260064011-A - SYSTEM AND METHOD FOR PERFORMING PROTECTION COORDINATION FOR AUTOMATIC FAILURE HANDLING OF DISTRIBUTION SYSTEM

KR20260064011AKR 20260064011 AKR20260064011 AKR 20260064011AKR-20260064011-A

Abstract

The protection coordination system for a power distribution system provided by the present invention comprises: a plurality of slave terminal devices installed corresponding to each of the circuit breaker switches installed for each predetermined protection coordination section, which collect and transmit power data indicating the operating status of the distribution line in the corresponding section and control the opening and closing of the corresponding circuit breaker switch; and a master terminal device that receives power data from each of the predetermined number of slave terminal devices, manages the received power data in an integrated manner, and determines whether a fault or circuit breaker is required for each of the corresponding protection coordination sections. By separating the collection of power data for each location and the protection coordination operation, and by integrally reflecting the characteristics of all the predetermined number of protection coordination sections when performing the protection coordination operation, it is possible to accurately determine and isolate the circuit breaker location, thereby reducing the power outage section and enabling rapid system restoration by accurately determining the fault section.

Inventors

김용삼
선용석
한규호
이충민
허윤희

Assignees

한전케이디엔주식회사

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (12)

In a protection coordination system for a power distribution system, A plurality of slave terminal devices installed corresponding to each of the circuit breaker switches installed for each predetermined protection coordination section, collecting and transmitting power data indicating the operating status of the distribution line of the corresponding section, and controlling the opening and closing of the corresponding circuit breaker switch; and A protection coordination system for a power distribution system characterized by including a master terminal device that receives power data from each of the aforementioned slave terminal devices, manages the received power data in an integrated manner, and determines whether to fault or cut off each of the corresponding protection coordination sections.
In paragraph 1, each of the above slave terminal devices is, In order to monitor a section distribution line, which is a distribution line included in a corresponding protection coordination section, power data including the current, voltage magnitude, and phase of the section distribution line is collected and transmitted to the master terminal device. A protection coordination system for a power distribution system characterized by controlling the opening and closing of a corresponding circuit breaker by means of the control of the above-mentioned master terminal device.
In paragraph 1, the master terminal device is, Basic protection coordination information including a predetermined number of protection coordination sections partitioned for protection coordination of a distribution line, protection coordination information set differently according to the type of each circuit breaker corresponding to each of the protection coordination sections, equipment setting information for each of the circuit breakers, and protection coordination calculation information for each of the protection coordination sections is stored in advance. After performing an integrated protection coordination operation by integrating and applying all of the power data received from each of the slave terminal devices to the basic protection coordination information, the status of blocking or fault is determined for each protection coordination section, and A protection coordination system for a power distribution system characterized by controlling each of the slave terminal devices to control the opening and closing of each of at least one blocking switch corresponding to each of the protection coordination sections as a result.
In paragraph 3, the master terminal device is, A protection coordination system for a power distribution system characterized by storing the protection coordination calculation result and the opening/closing control status information of each of the corresponding circuit breakers, and transmitting the protection coordination calculation result and the opening/closing control status information of each of the corresponding circuit breakers to an upper main unit.
In paragraph 4, the above master terminal device is, A protection coordination system for a power distribution system characterized by additionally storing log data including the cause of the failure when the above protection coordination fails, and transmitting said log data to said main device.
In paragraph 1, the master terminal device is, A protection coordination system for a power distribution system characterized by being able to be implemented as any one of the above-mentioned multiple slave terminal devices.
A protection coordination method for a distribution system using a protection coordination system comprising a plurality of slave terminal devices that collect and transmit power data indicating the operating status of a distribution line in a section for each predetermined protection coordination section, and a master terminal device that manages the power data in an integrated manner, and performing protection coordination using the same, wherein Each of the above slave terminal devices collects power data for a corresponding protection coordination section in a section-by-section power data collection step; The above master terminal device comprises a protection coordination calculation step that integrates the power data collected in the section-by-section power data collection step and performs a protection coordination calculation; The above master terminal device, based on the result of the protection coordination calculation, has a section-by-section diagnosis step for determining whether to fault or block each of the protection coordination sections corresponding to each of the slave terminal devices; and A protection coordination method for a power distribution system, characterized in that the master terminal device controls the slave terminal devices such that the opening and closing of the circuit breaker/switching device corresponding to each of the protection coordination sections is controlled based on the section-by-section diagnosis step.
In Clause 7, the above-mentioned section-by-section power data collection step is, A protection coordination method for a distribution system characterized by collecting power data including current, voltage magnitude, and phase of a section distribution line, which is a distribution line included in a corresponding protection coordination section, in order to monitor the section distribution line.
In paragraph 7, the above protection coordination calculation step is, A pre-setting step of pre-storing basic protection coordination information in the master terminal device, including a predetermined number of protection coordination sections partitioned for protection coordination of a distribution line, protection coordination information set differently according to the type of each circuit breaker corresponding to each of the protection coordination sections, equipment setting information for each of the circuit breakers, and protection coordination calculation information for each of the protection coordination sections; and A protection coordination method for a power distribution system characterized by including a calculation execution step of performing an integrated protection coordination calculation by integrating and applying all power data received from each of the above slave terminal devices to the above protection coordination basic information.
In paragraph 7, the above protection coordination control step is, A protection coordination method for a power distribution system characterized by including a circuit breaker control step in which the slave terminal device controls the opening and closing of a corresponding circuit breaker by means of the control of the master terminal device.
In Paragraph 7, The above master terminal device stores the protection coordination operation result and the opening/closing control status information of each of the corresponding blocking switching devices in a protection coordination control result storage step; and A protection coordination method for a distribution system, characterized in that the above master terminal device further includes a protection coordination control result transmission step in which the protection coordination calculation result and the opening/closing control status information of each of the corresponding circuit breakers are transmitted to an upper main device.
In Paragraph 11, In the event that the above protection coordination fails, The above master terminal device further stores log data including the cause of the failure in a log data storage step; and A protection coordination method for a power distribution system characterized by further including a log data transmission step for transmitting the above log data to the above main device.

Description

Protection coordination system for performing automatic fault handling of distribution system, and method thereof {SYSTEM AND METHOD FOR PERFORMING PROTECTION COORDINATION FOR AUTOMATIC FAILURE HANDLING OF DISTRIBUTION SYSTEM} The present invention relates to a distribution automation system, and more specifically, to a protection coordination system for automatic fault handling of a distribution system and a method thereof. A Distributive Automation System (DAS) is an automation system for power distribution systems designed for stable power supply. It refers to a system that installs remotely monitorable sensors and remotely operable automated switches throughout the distribution lines, and remotely monitors and operates them via a central control computer. To this end, the distribution automation system installs multi-functional terminal devices at each location along the distribution line that acquire field information of distribution facilities (e.g., status information, current, voltage, presence of faults, etc.) in real time and transmit it to a higher-level main unit; it monitors and controls the distribution system through communication between these devices, and protects the distribution system through appropriate protection coordination in the event of a system fault. In this regard, Korean Registered Patent No. 10-1398147 discloses an automatic fault handling system and method for a power distribution system using mutual communication of multi-functional terminal devices. According to the said patent, a multi-functional terminal device that generates fault data in cooperation with a protective device that cuts off the fault current when a fault occurs in the power distribution system can automatically isolate the fault section and automatically restore power to the healthy section by transmitting and receiving the fault data to and from each other. However, this conventional technology separates the distribution system into predetermined protection coordination sections, installs protection devices (e.g., circuit breakers, switches, etc.) for each section, and installs terminal devices for each protection device to operate protection coordination; however, the terminal devices could only reflect the characteristics of the specific location where each terminal device is installed and operated in the protection coordination. In other words, conventionally, each of the above terminal devices operated a circuit breaker method that utilized only the measurement information of the location and could not utilize the information of the subordinate entities, so power data (i.e., voltage, current) measured at the site could not be effectively utilized, and as a result, there was a problem that precise and rapid protection coordination was difficult. For example, conventionally, when a fault occurred in any section of the distribution system (i.e., any first protection coordination section), the entire section under the responsibility of any first circuit breaker that recognized the fault (i.e., two or more protection coordination sections under the responsibility of said first circuit breaker) was deactivated, resulting in a problem of unnecessary deactivation sections. Meanwhile, the power data from distribution lines operating throughout the entire distribution system is massive, so there was a problem where integrating and calculating this data collectively on the higher-level main unit placed an excessive load on the main unit's process. FIG. 1 is a schematic system configuration diagram of a distribution automation system to which a distribution system protection coordination system according to one embodiment of the present invention is applied. FIG. 2 is a flowchart of a processing procedure for a power distribution system protection coordination method according to one embodiment of the present invention. FIG. 3 is a diagram illustrating the line configuration and fault occurrence state of a distribution line requiring protection coordination, applying a distribution system protection coordination method according to one embodiment of the present invention. Figure 4 is a diagram illustrating the result of applying conventional protection coordination to the fault condition of the power distribution line exemplified in Figure 3. FIGS. 5 to 8 are drawings for explaining an example of protection coordination implementation of the present invention regarding a fault condition of a power distribution line exemplified in FIG. 3. Embodiments of the present invention are described below with reference to the attached drawings. The description is provided in detail to enable those skilled in the art to easily practice the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Meanwhile, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and simi