• Title/Summary/Keyword: Distributed Control System

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A Communication Method Between Distributed Control System and Function Test Facility Using TCP/IP and Shared Memory

  • Kim, Jung-Soo;Jung, Chul-Hwan;Kim, Jung-Taek;Lee, Dong-Young;Ham, Chang-Sik
    • Nuclear Engineering and Technology
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    • v.30 no.4
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    • pp.298-307
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    • 1998
  • In order to design mutual communication between a distributed control system and a function test facility, we used the Inter-Process Communication(IPC) in two systems and Transmission Control Protocol/Internet Protocol(TCP/IP) protocol. The data from the function test facility are put in the shared memory using an IPC, which is then accessed by the distributed control system through an Application Program Interface(API). The server in the function test facility includes two processes(one for sending and one for receiving), which are generated by the fork function from the client signal. The client in the distributed control system includes two separate programs(one for receiving and one for sending).

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The Development of Boiler Feedwater Master Control System for Power Plant (발전소 보일러 급수 주제어 시스템의 개발)

  • Lim, Gun-Pyo;Park, Doo-Yong;Kim, Jong-Ahn;Lee, Heung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.442-450
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    • 2012
  • Almost domestic power plants are being operated by foreign distributed control system. Many korean power plants are being operated over their lifetime so they need to be retrofitted. So we are developing the distributed control system to solve this problem by our own technique. The simulator was already made to verify the reliability of the algorithms. The unit loop function tests of all algorithms were finished in the actual distributed control system for installation of power plant and their results were satisfactory. The unit loop function tests are for each unit equipment algorithm. So the total operation tests will be made with all algorithms together in the actual distributed control system to be applied to power plant. When the verification through all tests is finished, algorithms with hardware will be scheduled to be installed and operated in the actual power plant. This research result will contribute to the safe operation of the deteriorated power plant and korean electric power supply as well as domestic technical progress. This entire processes and results for the development are written for the example of boiler feedwater master algorithm out of all algorithms in this paper.

Network Type Distributed Control System with Considering Data Collision (데이터 충돌을 고려한 네트워크형 분산 제어 시스템)

  • Choi, Goon-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.1
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    • pp.113-120
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    • 2015
  • Network type distributed control system uses a communication line which is named the BUS to exchange a data among the sub-systems. Usually, on the bus, only one data must be exited at one time, so the control algorithm to prevent collision or to manage a priority of data is important. Including CAN Protocol, many kind of FieldBus which are used for distributed control system, prevent data collision by controlling transmission time. But, a system which have to make a control signal or get a data from a sensor at fixed time will be met a problem when it is composed by using a network type distributed control structure. In this paper, some of these cases will be discussed and solutions be proposed for preventing a data collision. Also, using Arago Disk System which have a structure for inner loop control, the validity of the proposed methods will be verified.

Analysis of the redundant architecture for the fault-tolerance of a distributed control system

  • Moon, Hong-ju
    • Proceedings of the Korean Reliability Society Conference
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    • pp.231-238
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    • 2000
  • The distributed digital control system has many shared common components, and a single fault in the system may have effects on not a single function. Not as in an analog system, the faults in a digital system usually make discrete and abrupt changes in its output, which are hard to be expected. To cope with these situations, the fault-tolerance is an inevitable property of a distributed control system. A distributed digital control system consists of many equipments, and each equipment can be implemented by many different technologies. The fault-tolerance has to be implemented depend-ing on the overall architecture and how each equipment is implemented. The paper analyzes and compares the strategies and tactics to add the fault-tolerances in a distributed digital control system, and studies how they can be combined appropriately.

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PICNET Network Configurator for Distributed Control System

  • Kim, Dong-Sung;Lee, Jae-Young;Jun, Tae-Soo;Moon, Hong-Ju;Kwon, Wook-Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • pp.100-103
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    • 1999
  • In this paper, a method for the efficient implementation of the PICNET network configurator for a distributed control system(DCS) is proposed. The network configurator is composed of the time parameter estimator and the period scheduler, the file generator. The main role of network configurator estimates time parameter, the pre-run time scheduling of the user input and make the period transmission table for operating the PICNET based distributed control system.

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Development of a Plate Manufacturing CAD/CAM Program for a Optimal Layout and Distributed Control System

  • Kim, Hun-Mo
    • Journal of Mechanical Science and Technology
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    • v.14 no.10
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    • pp.1089-1103
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    • 2000
  • A Problem of relevant interest to some industries is that of obtaining optimum two-dimensional layout. To solve this provlem, one is given a number of rectangular sheets and an order for a specified number of each of certain types of two-dimensional regular and irregular shapes. The aim is to cut the the shapes out of the sheets in such a way as to minimize the amount of waste produced. A DCS (Distributed Control System) is an integrated system which applies the decentralization concept to a control system handling both sequential and analog control. A DCS performs many operations such as data gathering, data processing, data storing and monitoring the operatin conditions for the operator. IN this paper, we propose a genetic algorithm based on rotation parameters from which the best pattern of layout is found as well as a layout method for better performance time. A DCS for the plate cutting process system, which is performed by a virtual system, is also identified.

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RTD Temperature Instrumentation Test using Distributed Control System based on UNIX (UNIX기반의 Distributed Control System을 이용한 RTD 온도계측 실험)

  • KIM S.G.;LEE S.W.
    • Proceedings of the KIPE Conference
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    • pp.669-672
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    • 2002
  • 발전소등 대형 플랜트의 대규모 필드기기 제어용으로 많이 이용되고 있는 OVATION DCS(Distributed Control System) 시스템을 소개하고, RTD를 이용한 온도계측을 위하여 UNIX 워크스테이션을 기반으로 한 OVATION DCS 시스템의 콘트롤러 및 네트워크를 이용하여 현장 입력단 및 출력 포인터에 대한 전체 실험시스템을 구현하고, DCS 시스템의 구성 툴을 이용하여 RTD(Resistive Temperature Detector) 소자에 대한 변환계수를 산출하는 센서 Calibration 작업 및 I/O와 포인터에 대한 Configuration 구축 작업을 수행하였다 마지막으로 실질적인 온도의 측정이 정상적인지 확인하기 위해 포인터 정보 화면으로의 온도계측 값 출력 및 그래픽 디스플레이를 위한 트랜드 화면으로의 온도 출력 값을 확인하였다.

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Speed Control of DC Motor using Distributed Control System (분산형 제어시스템을 이용한 DC MOTOR 속도 제어)

  • Kim, Seung-Hyun;Jung, Joon-Hong;Park, Ki-Heon
    • Proceedings of the KIEE Conference
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    • pp.684-686
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    • 2004
  • This paper is concerned with the DC motor speed control using distributed control system. We design CAN nodes which can transmit control and monitoring data through CAN bus and apply these to distributed networked control system. The results of the experiment validate effectiveness of our distributed networked control system.

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Real-Time Characteristic Analysis of a DCS Communication Network for Nuclear Power Plants (원자력 발전소 분산 제어 시스템을 위한 네트워크의 실시간 특성 해석)

  • Lee, Sung-Woo;Yim, Han-Suck
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.5
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    • pp.650-657
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    • 1999
  • In this paper, a real-time communication method using a PICNET-NP(Plant Instrumentation and Control Network for Nuclear Power plant) is proposed with an analysis of the control network requirements of DCS(Distributed Control System) in unclear power plants. The method satisfies deadline in case of worst data traffics by considering aperiodic and periodic real-time data and others.

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Composition of operation window in a domestic boiler distributed control system (국내 발전소 보일러용 분산제어시스템 운전 화면 구성)

  • Shin, Mahn-Su;Byun, S.H.;Park, Du-Yong
    • Proceedings of the KIEE Conference
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    • pp.2027-2029
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    • 2001
  • In this paper, we are trying to think over operation window of application to a domestic boiler distributed control system. The detailed contents are a plant system overview, and operation window overview, difficulty in changing control system, vision.

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