• 제목/요약/키워드: System modelling

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대용량 태양광발전이 연계된 배전계통의 수용가 전압 특성해석에 관한 연구 (A Study on the Customer Voltage Characteristic of Distribution System with Large Scale PV)

  • 김병기;유경상;김찬혁;노대석
    • 전기학회논문지
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    • 제62권1호
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    • pp.29-36
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    • 2013
  • This paper deals with the analysis of the customer voltage characteristic in distribution system interconnected with large scale PV system. There would be many power quality issues which are caused by reverse power flow of PV system interconnected with distribution system. In order to analyze the effect of PV system on the customer voltage, detailed modeling method of distribution system and modified modelling method of PV system are proposed using PSCAD/EMTDC in this paper. So far, less than dozens KW of PV system can be simulated with the existing modelling method. Therefore, a new modeling method which can simulate the large scale PV system is proposed by considering the relationship equation on the phase and voltage in the current control algorithm. From the simulation result of proposed modelling method, it is confirmed that an optimal operation method in distribution system is suggested by analyzing the effect of PV system on customer voltage.

부산항 실시간 해양예보시스템 구축을 위한 기초연구 (Preliminary Study for Establishing the Realtime Ocean Prediction System in Busan Harbor)

  • 정연철;이호진
    • 한국항해항만학회지
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    • 제32권3호
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    • pp.245-250
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    • 2008
  • 근래 컴퓨터 수치모델이 급속하게 발전함으로써 다양한 분야에서 수치예보기술이 응용되고 있다. 실시간 해양예보시스템도 그 중의 하나로 관측시스템, 정보제공시스템 및 모델링 시스템을 결합하여 실시간 해양정보를 제공함으로써 해상교통의 안전과 연안환경의 보호에 기여하고 있다. 본 연구에서는 부산항 실시간 해양예보시스템의 구축을 위한 기초연구로서 모델링 시스템을 개발하였으며 그 결과를 제시하고 있다. 현재 기존의 관측자료가 부족하여 M2조석의 모델링만으로 시스템의 테스트를 행하였으나 앞으로 실시간 관측자료가 충분히 구비되면 전면적인 시스템의 테스트가 필요하다. 아울러 추후 관측시스템과 정보제공시스템이 계속 구축될 예정이며 이들 시스템이 모두 구비되고 나면 인터넷을 통한 실시간 정보제공이 이루어질 수 있을 것이다.

대량생산 체제의 Simulation을 위한 Activity 중심 Modeling (Activity-oriented Modeling of Mass Production System)

  • 최병규;박성주;신하용
    • 대한산업공학회지
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    • 제12권1호
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    • pp.119-131
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    • 1986
  • Described in this paper is a modelling methodology for mass production system simulation. The mass production system under consideration consists of various types of flow lines, special purpose production facilities, conveyor lines, palletized carts, and storage facilities. This type of production system is typical in home appliance industry, automobile industry, footwear industry, etc. where a variety of product mix are mass-produced. The modelling methodology is based on the "discrete-event formalism", and an "activity-oriented world view" is adopted to formalize the system description. A distinctive feature of the modelling methodology is that only the static structure (ie, system components) is included in the fixed model. The dynamic structure of the system is specified through a "data-driven" mechanism, which is an extension of the "experimental frame" concept. Each type of system components (ie, flow line, conveyors, carts, etc.) is formally modeled by using Activity Cycle Diagrams. The issue of "model structuring" is also addressed. The modeling methodology has been successfully applied in a real simulation study of a mass production system.

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위협 모델링 기반 함정 전투체계 보안 요구사항에 관한 연구 (A Study on Security Requirements of Shipboard Combat System based on Threat Modelling)

  • 윤성철;손태식
    • 한국군사과학기술학회지
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    • 제26권3호
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    • pp.281-301
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    • 2023
  • The shipboard combat system is a key system for naval combat that supports a command and control process cycle consisting of Detect - Control - Engage in real time to ensure ship viability and conduct combat missions. Modern combat systems were developed on the basis of Open Architecture(OA) to maximize acceptance of latest technology and interoperability between systems, and actively introduced the COTS(Commercial-of-the-shelf). However, as a result of that, vulnerabilities inherent in COTS SW and HW also occurred in the combat system. The importance of combat system cybersecurity is being emphasized but cybersecurity research reflecting the characteristics of the combat system is still lacking in Korea. Therefore, in this paper, we systematically identify combat system threats by applying Data Flow Diagram, Microsoft STRIDE threat modelling methodology. The threats were analyzed using the Attack Tree & Misuse case. Finally we derived the applicable security requirements which can be used at stages of planning and designing combat system and verified security requirements through NIST 800-53 security control items.

기록치 오차와 유역모형의 검정(II) - 모니터링 검정방법 - (Errors in Recorded Information and Calibration of a Catchment Modelling System(II) - Monitoring Calibration Approach -)

  • Choi, Kyung Sook
    • 한국농공학회지
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    • 제45권5호
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    • pp.117-125
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    • 2003
  • Since the recorded information used for operation of a catchment modelling system contain errors that influence the calibration of catchment modelling system control parameter values, the accurate estimation of these parameters is difficult. Despite these influences, existing traditional calibration approaches focus only on achieving the best "curve fitting" between simulated and recorded data, and not on generic evaluation of control parameter values. This paper introduces an Early Stopping Technique which is aimed at avoiding the procedure of curve-fitting through monitoring improvements in the objective function used for assessing the optimal parameter set. Application of this approach to the calibration of SWMM (Storm Water Management Model) on the Centennial Park catchment in Sydney, Australia is outlined. outlined.

로보틱 워크셀을 위한 그래픽 시뮬레이터의 구성에 관한 연구 (A Study on the Design of the Graphic Simulator for a Robotic Workcell)

  • 이상무;이범희;고명삼
    • 대한전기학회논문지
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    • 제39권4호
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    • pp.414-427
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    • 1990
  • This paper presents the development of the graphic simulator for an assembly workcell. The assembly workcell consists of two PUMA 560 manipulators, a conveyor belt system, a work table, and a vision sensor. In this study, the Petri Net theory is applied to model the assembly workcell and to construct the simulator. The event scheduling approach is used to simulate the cell. In order to show the graphic display of the simulation process, robot modelling, component modelling, and world modelling are included. The developed simulator is used to display the transition of the system state during the simulation. It is also used as a tool in selection the best resource states by studying the performance of the system as the resource states are changed.

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보령 T/P 6호기 PSS 모델링과 검증 (PSS Modeling and Cerification for #6 Generator of Boryong T/P)

  • 최홍관;김동준;문영환;김용학;윤용범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.31-34
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    • 2002
  • It studied modelling about employing analog PSS in domestic 500MW grade standard thermoelectric power plant in this paper. Modeling and parameters were verified by simulation of PSS response characteristics measured in AVR step examination and using power plant system model parameters decided by generator characteristics test. Through this PSS modelling research, contributed in domestic electrical power system small signal stability as that do modelling to be possible exact analysis of power system.

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Super-Lift DC-DC Converters: Graphical Analysis and Modelling

  • Zhu, Miao;Luo, Fang Lin
    • Journal of Power Electronics
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    • 제9권6호
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    • pp.854-865
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    • 2009
  • Super-lift dc-dc converters are a series of advanced step-up dc-dc topologies that provide high voltage transfer gains by super-lift techniques. This paper presents a developed graphical modelling method for super-lift converters and gives a thorough analysis with a consideration of the effects caused by parasitic parameters and diodes' forward voltage drop. The general guidelines for constructing and deriving graphical models are provided for system analysis. By applying it to examples, the proposed method shows the advantages of high convenience and feasibility. Both the circuit simulation and experimental results are given to support the theoretical analysis.

PC를 이용한 3차원 입체형상 모델링 시스템 개발 연구 (Study on the development of a personal computer aided 3-D geometric modelling system)

  • 변문현;오익수
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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    • pp.562-566
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    • 1988
  • The purpose of this study is to develop a personal computer aided 3-D geometric modeller. To perform this study, we set up a cube, a cylinder, and a prism as a primitive in the first segment of this study. By modelling the 3-D object through their transformation, addition, and subtraction, we proved the validity of the developed algorithm and its computer program. Some examples show the results of applying the program to modelling a few simple shape of the machine parts. These results met the first aim of this study.

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EQUIVALENT CIRCUIT REPRENSENTATION OF MAGNETIC FIELDS BASED ON FINITE ELEMENT MODELLING

  • Y. Kagawa;N. Wakatsuki;Kim, A. ura
    • 한국시뮬레이션학회:학술대회논문집
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    • 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
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    • pp.205-208
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    • 2001
  • A lumped electrical circuit is an approximate representation of the field within a curtain frequency range. The finite element modelling is a synonym of the equivalent circuit. The electric conduction field and electric potential wave field have been modelled by an admittance network and an LC low-pass filter network. Here in the present paper, the equivalent magnetic circuit representation is created for a magnetostatic field by the finite element modelling in two dimension.

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