• 제목/요약/키워드: Distribution Feeder

검색결과 224건 처리시간 0.021초

Feeder Loop Line Control for the Voltage Stabilization of Distribution Network with Distributed Generators

  • Jeong, Bong-Sang;Chun, Yeong-Han
    • Journal of Electrical Engineering and Technology
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    • 제9권1호
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    • pp.1-5
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    • 2014
  • When renewable sources are connected to the distribution network in the form of a distributed generators(DGs), the effect of intermittent output appears as voltage fluctuation. The surplus power at the consumer ends results in the reverse power flow to the distribution network. This reverse power flow causes several problems to the distribution network such as overvoltage. Application of the reactive power control equipment and power flow control by means of BTB inverter have been suggested as the general solutions to overcome the overvoltage, but they are not economically feasible since they require high cost devices. Herein, we suggest the feeder loop line switch control method to solve the problem.

적응 유전알고리즘을 이용한 배전계통 계획의 급전선 최적경로 선정 (An Adaptive Genetic Algorithm Based Optimal Feeder Routing for Distribution System Planning)

  • 김병섭;김민수;신중린
    • 대한전기학회논문지:전력기술부문A
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    • 제50권2호
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    • pp.58-66
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    • 2001
  • This paper presents an application of a newly designed Adaptive Genetic Algorithm (AGA) to solve the Optimal Feeder Routing (OFR) problem for distribution system planning. The main objective of the OFR problem usually is to minimize the total cost that is the sum of investment costs and system operation costs. We propose a properly designed AGA, in this paper, which can handle the horizon-year expansion planning problem of power distribution network in which the location of substation candidates, the location and amount of forecasted demands are given. In the proposed AGA, we applied adaptive operators using specially designed adaptive probabilities. we also a Simplified Load Flow (SLF) technique for radial networks to improve a searching efficiency of AGA. The proposed algorithm has been evaluated with the practical 32, 69 bus test system to show favorable performance. It is also shown that the proposed method for the OFR can also be used for the network reconfiguration problem in distribution system.

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휴리스틱 탐색전략을 이용한 배전계통 계획의 급전선 최적 경로 선정 (Optimal Feeder Routing for Distribution System Planning Using a Heuristic Strategy)

  • 최남진;김병섭;신중린
    • 대한전기학회논문지:전력기술부문A
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    • 제49권11호
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    • pp.566-574
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    • 2000
  • This paper propose a heuristic algorithm based on the Branch-Exchange (BE) method to solve Optimal feeder Routing(OFR) problem for the distribution system planning. The cost function of the OFR problem is consisted of the investment cost representing the feeder installation and the system operation cost representing the system power loss. We propose a properly designed heuristic strategy, which can handle the horizon-year expansion planning problem of power distribution network. We also used the loop selection method which can define the maximum loss reduction in the network to reduce calculation time, and proposed a new index of power loss which is designed to estimate the power loss reduction in the BE. The proposed index, can be considered with both sides, the low voltage side and voltage side branch connected with tie one. The performances of the proposed algorithms and loss index were shown with 32, 69 example bus system.

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배전계통의 다양한 이벤트들을 고려한 선로자동화 소프트웨어 개발 (Development of Feeder Automation Software Considering the Diversity Events of Distribution Systems)

  • 고윤석
    • 대한전기학회논문지:전력기술부문A
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    • 제52권8호
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    • pp.463-470
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    • 2003
  • This paper proposes an expert system, which is able to determine the problem-solving strategy for diversity events occurred on the distribution system. The events include events related to the fault, scheduled outage and optimal operating task such as feeder line fault, line scheduled outage, line overload, system load balancing, system loss minimization, main transformer fault, main transformer scheduled outage, main transformer overload, main transformer protection control. The expert system enhances the reliability of software designed by the integrated concept for the diversity events. The expert system is implemented in C language. And the effectiveness and accuracy for the expert system is verified by simulating the event cases for typical distribution model.

능동 데이터베이스를 이용한 배전선로 스위칭 자동화 (Feeder Switch Automation Using Active Database)

  • 최상열;윤창대;신명철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.250-252
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    • 2002
  • Since DAS(Distribution Automation System) has been typically managed for feeder automation in passive manner, it has to be managed by operator when feeder over loadings are detected therefore it may be possible for propagating the over loaded area by operator's mistake. To overcome the defect, The author proposed the feeder switch automation using active database.

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An Adaptive Setting Method for the Overcurrent Relay of Distribution Feeders Considering the Interconnected Distributed Generations

  • Jang Sung-Il;Kim Kwang-Ho;Park Yong-Up;Choi Jung-Hwan;Kang Yong-Cheol;Kang Sang-Hee;Lee Seung-Jae;Oshida Hideharu;Park Jong-Keun
    • KIEE International Transactions on Power Engineering
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    • 제5A권4호
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    • pp.357-365
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    • 2005
  • This research investigates the influences of distributed generations (DG), which are interconnected to the bus by the dedicated lines, on the overcurrent relays (OCR) of the neighboring distribution feeders and also proposes a novel method to reduce the negative effects on the feeder protection. Due to the grid connected DG, the entire short-circuit capacity of the distribution networks increases, which may raise the current of the distribution feeder during normal operations as well as fault conditions. In particular, during the switching period for loop operation, the current level of the distribution feeder can be larger than the pickup value for the fault of the feeder's OCR, thereby causing the OCR to perform a mal-operation. This paper proposes the adaptive setting algorithm for the OCR of the distribution feeders having the neighboring dedicated feeders for the DG to prevent the mal-operations of the OCR under normal conditions. The proposed method changes the pickup value of the OCR by adapting the power output of the DG monitored at the relaying point in the distribution network. We tested the proposed method with the actual distribution network model of the Hoenggye substation at the Korea Electric Power Co., which is composed of five feeders supplying the power to network loads and two dedicated feeders for the wind turbine generators. The simulation results demonstrate that the proposed adaptive protection method could enhance the conventional OCR of the distribution feeders with the neighboring dedicated lines for the DG.

피더부하 균등화지수를 이용한 배전계통의 긴급정전복구 및 부하균등화 (Emergency Service Restoration and Load Balancing in Distribution Networks Using Feeder Loadings Balance Index)

  • 최상열;정호성;신명철
    • 대한전기학회논문지:전력기술부문A
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    • 제51권5호
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    • pp.217-224
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    • 2002
  • This paper presents an algorithm to obtain an approximate optimal solution for the service restoration and load balancing of large scale radial distribution system in a real-time operation environment. Since the problem is formulated as a combinatorial optimization problem, it is difficult to solve a large-scale combinatorial optimization problem accurately within the reasonable computation time. Therefore, in order to find an approximate optimal solution quickly, the authors proposed an algorithm which combines optimization technique called cyclic best-first search with heuristic based feeder loadings balance index for computational efficiency and robust performance. To demonstrate the validity of the proposed algorithm, numerical calculations are carried out the KEPCO's 108 bus distribution system.

Voltage Impacts of a Variable Speed Wind Turbine on Distribution Networks

  • Kim, Seul-Ki;Kim, Eung-Sang
    • KIEE International Transactions on Power Engineering
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    • 제3A권4호
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    • pp.206-213
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    • 2003
  • The main purpose of this paper is to present a simulation model for assessing the impacts of a variable speed wind turbine (VSWT) on the distribution network and perform a simulation analysis of voltage profiles along the wind turbine installed feeder using the presented model. The modeled wind energy conversion system consists of a fixed pitch wind turbine, a synchronous generator, a rectifier and a voltage source inverter (VSI). Detailed study on the voltage impacts of a variable speed wind turbine is conducted in terms of steady state and dynamic behaviors. Various capacities and different modes of variable speed wind turbines are simulated and investigated. Case studies demonstrate how feeder voltages are influenced by capacity and control modes of wind turbines and changes in wind speed under different network conditions. Modeling and simulation analysis is based on PSCAD/EMTDC a software package.

신 배전자동화 시스템의 하드웨어 및 소프트웨어 설계 (The hardware and software design of new distribution automation system)

  • 하복남;한용희;이중호;조남훈;임성일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 C
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    • pp.1428-1430
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    • 1999
  • The New Distribution Automation System(NDAS) was composed of several equipments, computer system, communication system, feeder remote unit, switches and so on. In this paper, we introduce the conception of hardware and software design about Central Control System, the communication method and protocol in Feeder Remote Unit, the Automatic Switch, the operating software, consideration factors in the feeder automation(FA) and the system configuration of NDAS in power distribution test center.

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배전선로 연계용량 선정방안에 관한 연구 (A Study on Decision Plan of Hosting Capacity for Distribution Feeder)

  • 김성만;오준석;김옥희;임현옥;문채주
    • 한국전자통신학회논문지
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    • 제16권4호
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    • pp.653-660
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    • 2021
  • 재생에너지 자원은 비용감소, 정부 보조금, 지속가능성 등의 목적에 연계되어 전 세계적으로 전기를 생산하는 설비의 필수적인 영역으로 급속하게 진행되고 있다. 풍력, 태양광 및 부하가 상호작용하여 발생하는 예측오차는 배전계통, 선로 혼잡도, 전압과 무효전력 안정도 여유 등 예기치 않은 심각한 충격을 발생시킬 수가 있다. 이 충격은 전력계통에서 변동성 재생에너지의 보급이 증가함에 따라 더 커질 것이다. 우리나라는 배전선로에 연결될 수 있는 재생에너지의 최대 용량은 송배전용전기설비이용규정에 의해 제한된다. 이 연구는 기존 송전설비의 중대한 설비 개조가 필요하지 않는 배전선로에 대한 연계용량 결정방안을 기술한다. 특히 선로 케이블의 연계용량 기준과 배전선로의 최소부하 계산에 관하여 제안과 검토를 한다.