• Title/Summary/Keyword: EMTP

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Modeling of Transformer Inrush Current using EMTP-RV (EMTP-RV를 이용한 변압기 여자돌입전류 모델링)

  • Seo, H.C.;Yeo, S.M.;Kim, C.H.;Yoo, Y.S.;Jo, B.S.
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.610-611
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    • 2007
  • 본 논문은 EMTP-RV를 이용하여 변압기 여자돌입전류를 모델링하는 방법을 제시하였다. 우선, 변압기 여자돌입전류의 특성을 조사하였다. 그 다음으로, EMTP-RV의 변압기의 모델링 방법을 분석하여 변압기 여자돌입전류 모델링을 위한 적절한 방법을 선택하였다. 마지막으로, 다양한 조건에 대하여 여자돌입전류를 모델링하여 그 방법의 적합성을 증명하였다.

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Design Methodology of the Bus Configuration and Protection Coordination Basic Logics of Power Substation Using EMTP-RV (EMTP-RV를 이용한 변전소 모선 방식과 보호협조 기초 논리 설계 방법론에 대한 연구)

  • Ko, Yun-Seok
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.6
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    • pp.1129-1138
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    • 2019
  • Since substations are structurally complex due to the concentration of protection coordination facilities with substation facilities for long distance power transmission, it is difficult to design a protection coordination system to minimize the spreading effect of the fault when a fault occurs on transmission line or distribution line. Therefore, in this paper, the bus configuration and the basic logic of protection coordination that have a major influence on the reliability of substation power supply were analyzed, and the substation protection coordination logic to detect internal and external faults was developed based on EMTP-RV. As the basic logic of substation protection coordination, the percent differential protection relay logic for substation internal fault detection and the overload protection relay logic for inference of external failure were modeled. Finally, the 154kV substation including the protection coordination logic was modeled using EMTP-RV, and the effectiveness of the protection coordination design methodology was confirmed through the several fault simulation cases based on EMTP-RV.

Underground Transmission Cable Sheath Voltage Analysis Using EMTP (EMTP를 이용한 송전케이블 시스전압 분석)

  • Oh, Dong-Soo
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.428-430
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    • 2000
  • This paper describes under-ground transmission cable sheath voltage by using EMTP and proposes a new design method for calculating cable sheath voltage in steady state. The cross bonding system of power cable is modeled on ${\pi}$ equivalent circuit and the sheath voltage(current) of cable can be analyzed with comparing to conventional method.

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Establishment of EMTP Modeling Method Using Searching Coil Test for HVDC Submarine Cables (써칭코일 시험을 통한 HVDC 해저케이블 EMTP 모델링 기법 정립)

  • Jung, Chae-Kyun;Park, Hung-Sok;Yang, Byeong-Mo;Kang, Ji-Won;Lee, Jong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.9
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    • pp.1593-1599
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    • 2010
  • This paper describes the EMTP modeling method using searching coil test for HVDC submarine cables. HVDC submarine cables consist of conductor, lead sheath and amore. It is different from general cable which is composed with just conductor and aluminium sheath. Therefore, the transient characteristics are totally different between HVDC submarine cable and general cable. However, the study on HVDC cable modeling and transient are insufficient. In this paper, EMTP modeling is performed according to grounding interval and grounding resistance, then they are compared with real test results by searching coil test.

The Analysis Results of Lightning Overvoltages by EMTP for Lightning Protection Design of 500kV Substations

  • Ju Hyung-Jun;Lee Heung-Ho
    • KIEE International Transactions on Power Engineering
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    • v.5A no.4
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    • pp.366-370
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    • 2005
  • To meet increasing power demand, 500 kV power systems are under consideration in the regions of some Middle Asian countries. As the power system voltage becomes higher, the cost for the power system insulation increases significantly. 500 kV transmission systems will become the basis of a region's power system and they require much higher system reliability. Consequently, by the methods of limiting overvoltages effectively, a reasonable insulation design and coordination must be accomplished. In particular, the Substations must be constructed to be of outdoor type. In order to determine the various factors for the insulation design, the EMTP (Electro-magnetic transient program) is used for the magnification of transient phenomena of the 500 kV systems in the planned network. In this paper, we will explain the calculation results of lightning overvoltages by the EMTP for lightning protection design for the 500 kV substations. To obtain reliable results, the multi-story tower model and EMTP/TACS model are introduced for the simulation of dynamic arc characteristics.

Implementation of Frequency Relaying Algorithm based on Multi-Agent System using EMTP-MODELS (EMTP-MODELS를 이용한 Multi-Agent System 기반의 주파수 계전 알고리즘 구현)

  • Lee, Byung-Hyun;Kim, Chul-Hwan;Yeo, Sang-Min
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.12
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    • pp.2072-2077
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    • 2007
  • The primary objective of all power systems is to maintain the reliability and to minimize outage time for fault or the others. The frequency relaying algorithm perceives a variation of system frequency and thereafter detects the unbalance between generation and load. A multi-agent system is composed of multiple interacting computing elements that are known as agents. In this paper, frequency relaying algorithm is designed by multi-agent system and is implemented by EMTP-MODELS. To verify performance of the frequency relaying algorithm based on multi-agent system, simulations by EMTP have been carried out.

A Study on the Dynamic Responses of a PWM Based UPFC for the Application to Power System Through EMTP Simulation (EMTP 모의를 통한 PWM 방식 UPFC의 동적 특성 분석 및 전력 시스템 적용에 관한 연구)

  • Won, Dong-Jun;Han, Hak-Geun;Lee, Song-Geun;Mun, Seung-Il
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.49 no.12
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    • pp.581-588
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    • 2000
  • This paper presents the power system application of a PWM base UPFC through EMTP simulation. A PWM base UPFC model is constructed and detailed switching-level simulation is performed using EMTP. The dynamic responses of UPFC are analyzed. Based on the simulation results, the appropriate equivalent impedances of UPFC voltage-source model which represent similar dynamics with PWM based UPFC are determined by optimization routine. This paper also analyzes the influence of the power system strength on the dynamic responses of UPFC. Finally this paper shows that the performance of UPFC is improved by control parameter tuning when UPFC is installed to weak power system.

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Analysis of Lightning-Induced Overvoltage and Current in Buried Underground Distribution Cable using EMTP/MODELS (EMTP/MODELS를 이용한 지중 배전선로의 뇌유도 과전압 및 전류 분석)

  • Seo, Hun-Chul;Han, Jun;Kim, Chul-Hwan;Choi, Sun-Kyu;Lee, Byung-Sung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.8
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    • pp.1077-1082
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    • 2012
  • This paper analyzes the lightning-induced overvoltage and current in buried underground distribution cable. Based on analytical expressions, the lightning-induced overvoltage and current in buried underground distribution cable is calculated by EMTP/MODELS. The modeling is verified by comparing with the results in reference. Also, the type and buried arrangement of cables used in domestic distribution line are modeled by EMTP/ATPDraw. The various simulations according to the type and buried arrangement of cable are performed and the simulation results are analyzed.

Analysis of Surge in Distribution System and ESS due to Direct Lightning in Distribution System with ESS using EMTP (EMTP를 이용한 ESS가 연계된 배전계통에서 직격뢰 발생 시 계통 및 ESS 측의 서지 해석)

  • Seo, Hun-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.2
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    • pp.47-53
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    • 2015
  • The study concerning about the grid connection of the large-capacity energy storage system(ESS) is increasing. However, the transient study such as lightning or switching surge necessarily occurred at power system with ESS has been hardly performed. Therefore, this paper performs the analysis of lightning surge in distribution system with ESS using electromagnetic transient program(EMTP). The battery model in Matlab/Simulink is modeled by EMTP, which is the specialized software for power system transient study. Also, the bi-directional power electronics for interconnection of the battery and distribution system are modeled by EMTP. When the lightning is occurred at interconnection point of ESS, this paper simulates the existence of ESS and operation conditions of ESS and analyzes the surge in distribution system and ESS according to the various conditions.

Implementation of Out-of-Step Detection Algorithm based on Multi-Agent System using EMTP-MODELS (EMTP-MODELS를 이용한 Multi-Agent System 기반의 동기탈조 검출 알고리즘 구현)

  • Lee, Byung-Hyun;Yeo, Sang-Min;Lee, You-Jin;Sung, No-Kyu;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.4
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    • pp.537-542
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    • 2008
  • The protection against transient instability and consequent out-of-step condition is a major concern for the utility industry. Unstable system may cause serious damage to system elements such as generators and transmission lines. Therefore, out-of-step detection is essential to operate a system safely. Also, a multi-agent system is one that consists of a number of agents, which interact with one another. Multi-agent systems(MAS) can offer the flexibility and the adaptability to the previous algorithm. In this paper, the detection algorithm of out-of-step is designed by multi-agent system and implemented by EMTP-MODELS. To verify performance of the proposed algorithm based on multi-agent system, simulations by EMTP have been carried out.