A Practical Voltage Error Correction Technique for Distribution System under Distribution Automation Environment

Muhammad Aslam,Hyung-Seung Kim,Myeon-Song Choi,Seung-Jae Lee 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2

Transmission system has been well studied since long time and power system techniques of distribution system are more or less derived from transmission system. However, unlike transmission systems, many practical issues are encountered in the distribution system. Considerable amount of error is observed in voltage obtained from the Feeder Remote Terminal Units (FRTUs) measured by the pole mounted PTs along the distribution feeder. Load uncertainty is also an issue in distribution system. Further, penetration of Distributed Generators (DGs) creates voltage variations in the system. Hybrid radial/ loop distribution system also make it complicated to handle distribution system. How these constraints to be handled under Distribution Automation (DAS) environment in order to obtain error free voltage is described in this paper and therefore, a new approach of voltage error correction technique has been proposed. The proposed technique utilizes reliable data from substation and the FRTUs installed in DAS. The proposed technique adopts an iterative process for voltage error correction. It has been tested and proved accurate not only for conventional radial systems but also for loop distribution systems.

배전지능화 단말장치의 모의시험을 위한 가상 배전계통 HILS 시스템 개발

이원석(Won-Seok Lee),송진욱(Jin-Uk Song),황선환(Seon-Hwan Hwang) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.3

This paper proposes a virtual distribution HILS(Hardware-In-the-Loop Simulation) system for testing of FRTU(Feeder Remote Terminal Unit) for distribution automation systems. Recently, the distribution automation systems have been complicated because of the reliability improvement of the power system, new power distribution facilities, and upgrading the operating system. However, real-time digital simulators are difficult to build systems due to expensive facilities and cannot implement actual distribution automation systems. Therefore, in this paper, the HILS system is developed by using FRTU, interface devices based on DSP(Digital Signal Processor), Labview monitoring through the TCP/IP communication, and real-time power system analysis simulator. The proposed HILS system is verified through the results of systematic analysis of distribution automation systems, real-time simulation, and functional verification by using the feeder remote terminal unit.

A Practical Voltage Error Correction Technique for Distribution System under Distribution Automation Environment

Aslam, Muhammad,Kim, Hyung-Seung,Choi, Myeon-Song,Lee, Seung-Jae The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.2

Transmission system has been well studied since long time and power system techniques of distribution system are more or less derived from transmission system. However, unlike transmission systems, many practical issues are encountered in the distribution system. Considerable amount of error is observed in voltage obtained from the Feeder Remote Terminal Units (FRTUs) measured by the pole mounted PTs along the distribution feeder. Load uncertainty is also an issue in distribution system. Further, penetration of Distributed Generators (DGs) creates voltage variations in the system. Hybrid radial/ loop distribution system also make it complicated to handle distribution system. How these constraints to be handled under Distribution Automation (DAS) environment in order to obtain error free voltage is described in this paper and therefore, a new approach of voltage error correction technique has been proposed. The proposed technique utilizes reliable data from substation and the FRTUs installed in DAS. The proposed technique adopts an iterative process for voltage error correction. It has been tested and proved accurate not only for conventional radial systems but also for loop distribution systems.

시스템적 접근에 의한 자동화컨테이너터미널 개발 과제 도출

박창호,노홍승,정희균 한국항해항만학회 1998 한국항만학회논문집 Vol.9 No.-

This study is to find subjects for the Automated Container Terminal(ACT) development and container terminal system in Pusan port and its automation level by systems approach. And this paper aims at evaluating on the priority of R&D investment until the beginning of the second stage of New Pusan Project(2006). In this process we have considered 8 evaluation indexes (cost, labor, area, time, volume, reliability, safety, convenience) to analyze 6 subsystems. The priority of R&D until target year by sub-systems is as follow ; 1. Cargo Handling System, 2. Transfer System, 3. Port Entry System, 4. Storage System (Distribution & Manufacturing System included), 5. Inland Transport System, 6. Port Management & Information System.

인공지능을 이용한 배전계통의 정전복구에 관한 연구

이흥재 광운대학교 신기술연구소 1998 신기술연구소논문집 Vol.27 No.-

전력시스템이 점차 대형화되고 복잡해짐에 따라 전력시스템 자동화는 전력시스템의 신뢰성 향상과 효율적인 운용을 위해 그 필요성이 증대되고 있으며 배전계통의 정전 복구는 전력시스템 자동화의 주요한 분야중 하나이다. 본 논문은 인공지능 기법을 이용하여 배전 변전소 자동화 시스템과의 계충적 연계에 의한 건전 정전 구역복구를 수행하는 새로운 배전 복구 시스템을 제안한다. 본 논문에서 제안된 배전 복구 시스템은 전체 복구 영역을 배전 변전소까지 확장하므로써 시스템의 복구 수행능력 향상은 물론 효율적인 복구 스위칭도 아울러 도모하였다. As the power system network is enlarged and complicated gradually, the automation of power system network is essential to enhance the reliability and Performance of the operation of power system. Distribution restoration is a major part of the automation. This paper proposes a new distribution restoration system to restore healthy blackout regions by the hierarchical cooperation with the substation automation systems using artificial intelligence In Proposed system, the range of restoration is extended to substations and the performance as well as the switching efficiency of restoration system is enhanced.

시스템적 접근에 의한 자동화컨테이너터미널 개발 과제 도출

박창호(C. H. Park),노홍승(H. S. Roh),정희균(H. G. Jeong) 한국항해항만학회 1998 한국항해항만학회 학술대회논문집 Vol.2 No.1

This study is to define the Automated Container Terminal(ACT) and container terminal system. Also, we analyze the present condition of the container terminal system in Pusan port and its automation level by systems approach. And this paper aims at evaluating on the priority of R&D investment until the beginning of the second stage of New Pusan Port Project(2006). In this process we have considered 8 factors (cost, labor, area, time, volume, reliability, safety, convenience) to analyze 6 subsystems. The priority order of R&D until target year by sub-systems is as follow; Cargo Handling System > Transfer System > Port Entry System > Storage System(Distribution & Manufacturing System included) > Inland Transport System > Port Information System.

CIM 기반의 Distribution Automation System에 관한 연구

이희주(Hee-Joo Lee),서정일(Jeong-Il Seo),한주현(Ju-Hyun Han) 대한전기학회 2011 전기학회논문지 Vol.60 No.5

Distribution systems for operating the various systems should be operated organically. Distribution systems for organic operations extend the functionality of the system and system integration for the extension is doing. However, in systems integration for each unique non-standard definition of linkage and exchange systems are used. Non-standard definition of a unique linkage and exchange systems in the maintenance and expansion will result in many negative results. To solve these problems, the system and the exchange of information about the links between systems should define standards. IEC (International Electrotechnical Commission) power to solve these problems in the field of the Common Information Model (Common Information Model, CIM) standard (IEC61970, IEC61968) is defined as the transmission and distribution system integration and standardization for the exchange of information.. In this paper, standardized system for building CIM-based distribution automation system should describe the process of building. In addition, the process of establishing a common information model needed (CIM) defined and associated services for a defined set of models is proposed in the standardization process.

배전자동화 시스템에 IEC 61850 적용 방안

김태완(Taw-Wan Kim),임일형(Ilhyung Lim),최면송(Myeon-Song Choi),이승재(Seung-Jae Lee),권성철(Sung-Chul Kwon) 대한전기학회 2011 전기학회논문지 Vol.60 No.4

In this paper, problems and solutions are proposed for applying IEC 61850 to Distribution Automation System(DAS). Communication protocol integration in power automation system have issued by IEC standards, IEC 61850 of them has researched for applying IEC 61850 to many areas of power system in spite of that it was made for substation automation system. Especially, DAS is just about to apply IEC 61850 by communication network change from serial to ethernet although DNP 3.0 is used. But it's impossible to apply directly IEC 61850 to DAS by difference of environment which unfixed wide area and separated nodes in power distribution system unlike concept of IEC 61850 is made by Substation Automation System(SAS) environment of limited space. Thus, this paper proposed applications of three types which conceptual, practical, and future to consider problems and solutions when apply IEC 61850 to Ethernet based DAS.

Single line-to-ground fault location based on unsynchronized phasors in automated ungrounded distribution systems

Nam, Soon-Ryul,Kang, Sang-Hee,Ahn, Seon-Ju,Choi, Joon-Ho Elsevier 2012 Electric power systems research Vol.86 No.-

<P><B>Highlights</B></P><P>► SLG fault location algorithm for automated ungrounded distribution systems. ► Identification of the faulted section based on approximate zero-sequence angles. ► Synchronization of unsynchronized phasors using phase compensation. ► Fault location through application of an orthogonal operator to the voltage equation. ► Performance evaluation using fault signals generated by the EMTP.</P> <P><B>Abstract</B></P><P>This paper proposes a new method for locating single line-to-ground (SLG) faults in ungrounded distribution systems. A distribution automation system is required to obtain all the required information from feeder remote terminal units via a communication channel with unpredictable time delays. Before locating a SLG fault, the faulted section is identified based on the absolute difference between the approximate zero-sequence angles of two adjacent nodes. Fault location starts by obtaining the synchronized zero-sequence voltage and current at the faulted node. This is achieved by forward calculation from the zero-sequence voltage and current at the substation. Because the zero-sequence current at the faulted node is calculated in synchronization with the substation, the other phasors at the faulted node are synchronized by phase compensation based on the phase difference between the synchronized and measured phasors corresponding to the zero-sequence current. Using the synchronized phasors, the fault location is identified through application of an orthogonal operator to the voltage equation at the faulted node. The performance of the proposed algorithm was evaluated using fault signals generated by the EMTP. The simulation results confirmed the validity and efficiency of the proposed algorithm for locating SLG faults in ungrounded distribution systems.</P>

시스템 통합을 위한 IEC 61970/61968 기반의 CIMToolkit 개발

허동욱(Dong-Uk Heo),서정일(Jeong-Il Seo),한주현(Ju-Hyun Han),손성용(Sung-Yong Son) 대한전기학회 2011 전기학회논문지 Vol.60 No.8

Since IT technology was combined with the power system, many systems and applications have been developed and also Integration between systems has been followed in order to meet much higher level. Futher more to reduce the cost of system integration there were needs standardized data model and interfaces among systems or applications. so IEC has reached to establish standard interfaces and data model. Most of the current distribution automation system in South Korea, each operating independently in an enclosed environment, are managed. As time goes by, however, because of resons that the system is increasingly complex by implenting new kind of power source and demand for electricity is rapidly increasing, it became difficult to predict with a independent data from one system. In this paper, In order to apply common infomation model and standard interfaces which are defined in IEC 61970/61968 to the exisiting distribution automation system in KEPCO, several software tools and applications which have been created will be introduced.