• Title, Summary, Keyword: Autonomous operation

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Conceptual design of autonomous emergency operation system for nuclear power plants and its prototype

  • Kim, Jonghyun;Lee, Deail;Yang, Jaemin;Lee, Subong
    • Nuclear Engineering and Technology
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    • v.52 no.2
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    • pp.308-322
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    • 2020
  • This paper presents a conceptual design for a plant-wide autonomous operation system that uses artificial intelligence techniques. The autonomous operation system has the power and ability to perform the control functions needed for the emergency operation of a nuclear power plant (NPP) with reduced operator intervention. This paper discusses the emergency operation and level of automation in an NPP and presents the design requirements for an autonomous emergency operation system (A-EOS). Then, an architecture that consists of several modules is proposed, with descriptions of the functions. Finally, this paper introduces a prototype of the suggested autonomous system that integrates the authors' previous works.

Emergency Mode Algorithm Considering Remote Operation/Control and Autonomous Level of Unmanned Surface Vehicle (무인수상정에서의 원격운용통제 및 자율수준을 고려한 비상모드 알고리즘)

  • Youn, Jong-Taek;Kim, Yongi;Baik, Jae Woong;Lim, Jae Hyun;Yu, Chan-Woo;Kim, Jung-Hoon
    • IEMEK Journal of Embedded Systems and Applications
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    • v.12 no.5
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    • pp.319-330
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    • 2017
  • In remote USV (Unmanned Surface Vehicle) maritime operation, the remote operation and control technic and autonomous control technic is required and the emergency mode algorithm is needed certainly for sailing and accomplishing various surveillance, reconnaissance, and underwater search missions of USV. In this paper, we review the countermeasures in emergency situation of the existing USV system (Barracuda) and propose the emergency mode algorithm considering the operation and control, and autonomous control level for the stable USV operation in case of emergency. We analyzed the autonomous control level in view of the mission complexity and environmental difficulty, and human interface, and verified the performance of the autonomous control level when we apply four emergency mode algorithms. It is expected that more stable and reliable operation and cotrol are possible if the proposed algorithm is applied to the environments requiring the various multi-mission USV sailing and mission achievement.

Autonomous SpeedSprayer Using DGPS and Fuzzy Control (II) - Real Operation - (DGPS와 퍼지제어를 이용한 스피드스프레이어의 자율주행(II) - 실제주행 -)

  • 이재훈;조성인;이정엽
    • Journal of Biosystems Engineering
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    • v.23 no.1
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    • pp.75-82
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    • 1998
  • Autonomous speedsprayer operation was conducted using a fuzzy controller combined with a DGPS. The signal of DGPS receiver and signals of four ultrasonic sensors were processed in real time. The speedsprayer was steered with two levers controlled by two hydraulic cylinders. The fuzzy controller has two inputs; direction of running obtained from the DGPS receiver and distance from trees measured by ultrasonic sensors. The operation times of the hydraulic cylinders were inferred as outputs of the fuzzy controller. Field test results showed that the speedsprayer could be autonomously operated by the developed fuzzy controller including turning operation in the end of the tree row. The ultrasonic sensors contributed a little to performance of the autonomous operation, but the speedsprayer could avoid trees or obstacles in emergent situations with them.

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Map-Based Control for Autonomous Tractors

  • Han, S.;Shin, B.S.;Zhang, Q.
    • Agricultural and Biosystems Engineering
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    • v.4 no.1
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    • pp.22-27
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    • 2003
  • An autonomous tractor requires not only automatic steering (automatic guidance) but also automated control of tractor functions and implement operations. Examples of tractor functions include engine throttle, transmission speed, and 3-point hitch position. Implement operations include tillage, planting, and cultivating. This article provides an overview of a map-based methodology used for the implementation of autonomous field operations of agricultural tractors. The procedure for developing autonomous field operation maps were presented, and several important issues in the implementation of map-based autonomous operations were discussed. These issues included combining field operation maps, position offset, and real-time sensing and update of field operation maps.

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Local Path Planning Manager for Autonomous Navigation of UGV (무인차량의 자율주행을 위한 지역경로계획 매니저)

  • Lee, Young-Il;Lee, Ho-Joo;Park, Yong-Woon
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.6
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    • pp.990-997
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    • 2010
  • The Mission environment of UGV(Unmanned Ground Vehicle) has a complexity and variety, and the status of system and sensor is dependent on the environment factors such as operation time, the weather and road type. It is necessary for UGV to cope adaptively with the various mission types, operation modes and operation environment as human operators do. To satisfy this necessity, we present an autonomy manager based on the autonomous architecture. In this paper, we design a path planning software architecture and LPP manager by using open autonomous architecture which is previously designed by ADD. Field test is conducted with UGV in order to verify the performance of LPP Manager based on the Autonomous Architecture with scenarios.

The System Design and Demonstration for Autonomous Microgrid Operation

  • Jyung, Tae-Young;Jeong, Ki-Seok;Baek, Young-Sik;Kim, Heung-Geun;Seo, Gyu-Seok
    • Journal of Electrical Engineering and Technology
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    • v.7 no.2
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    • pp.171-177
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    • 2012
  • The autonomous microgrid is a system that is autonomously operated depending on the grid and internal load condition, without the operator's intervention. In this study, a control algorithm for the microsource and an operation algorithm for the microgrid are proposed to realize the autonomous microgrid system. In addition, a microgrid operation system based on the operation algorithm is proposed. The electromagnetic transient program is used by the proposed microsource control algorithm for simulation, and the validity of the algorithm is verified. The proposed operation system is verified based on a case study using a simulator and test devices.

Development of Low-voltage Seamless Transfer Microgrid on Grid-connected Type Islands by Autonomous Operation (자율운전에 의한 계통연계형 도서의 저압 무순단 마이크로그리드 구축)

  • Kim, Jeong Hun;Kwon, Jung-Min;Yun, Sang-Yun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.66 no.4
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    • pp.169-176
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    • 2017
  • This paper presents research on low-voltage microgrids to maintain a continuous power supply to critical loads on grid-connected islands in Korea. The low-voltage microgrids of this paper focused on that changes public office buildings into uninterrupted microgrids by autonomous operation. For this, a microgrid controller (MGC) and a power conditioning system (PCS) that allow a seamless transfer between grid-connected and grid-isolated operation are proposed. The proposed PCS operates with a silicon controlled rectifier (SCR) switch and employs a simple structure. It supplies power continuously without operators through a coordinated operation between MGC and PCS. In addition, proposed MG has a schedule operation for minimizing electricity charges and provides ancillary services that enable the utilization of resources according to the operation purpose of utility distribution networks. To demonstrate the uninterrupted low-voltage microgrid proposed in this study, a microgrid was implemented and tested in a public office building in Anjwa Island, Jeollanam-do in Korea. A seamless, autonomous operation history, despite system disturbances, was obtained through a long-term demonstration of operation. The results showed that the proposed microgrid technology can be used to achieve energy resilience in grid-connected island areas.

Autonomous Decentralized Container Terminal Operating System (자율 분산형 컨테이너 터미널 시스템)

  • 배민주;김환성
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.393-397
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    • 2004
  • In these days, a scale of system is more and more complex and large. The centralized system has the operation management method to be limited in the large scale system. In this paper, we proposed ACOS(Autonomous decentralized Container terminal Operating System). It is applied to container terminal using by autonomous decentralized system which can solve the problem of the centralized operation system. Also, we can defined a function of the ACOS's sub-system and showed a flowchart on operation method for the ACOS.

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An Empirical Study on Autonomous Operation in Emergency Situation of Microgrids (마이크로그리드의 비상상황시 자율 대처 운전 방안에 관한 실증적 연구)

  • Hong, Ji-Song;Kim, Hyun-Woo;Ahn, Seon-Ju;Choi, Joon-Ho;Yun, Sang-Yun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.12
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    • pp.1595-1601
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    • 2018
  • The biggest obstacle to the commercialization of small and medium size microgrid (MG) is the reliability and economics of MG operation and maintenance. In this paper, we propose an autonomous operation method that is implemented as an application program installed in the MG operating system in emergency situations. The proposed algorithm consists of four steps of distinction, recognition, determination and control of emergency situations that can occur in MG. A fuzzy-based situation decision algorithm has been proposed to eliminate the barriers of autonomous operation in actual emergency situation such as occurrence of bad data and communication delay. In addition, countermeasures have been suggested for cases where multiple emergency situations have occurred in combination. The proposed algorithm was tested in a 500kW actual microgrid site of a university. Through the test, the validity of the proposed method and its applicability to practical MG operation are verified.

Tele-operation of A Low-cost Un-autonomous Mobile Robot Using A New Fuzzy Command Smoothing Concept (새로운 퍼지 명령 스무딩 개념을 이용한 저가형 비자율주행 이동로봇의 원격제어)

  • Yoo Bong-Soo;Joh Joongseon
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.9
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    • pp.809-815
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    • 2004
  • Researches on mobile robots have been mainly focused on the autonomous navigation and a lot of interesting results have been published so far. Most of applications are, however, fancy, unpractical, and very expensive to be used for 'UN-expensive' purpose. Well-known soccer robot may be an example of unpractical application. Un-autonomous mobile robot has, however, potential for a lot of practical applications. Especially, tele-operation of the un-autonomous mobile robot may the central issue of research. Major research topics for the tele-operated un-autonomous mobile robot include development of a force reflecting joystick for tele-operation and development of a sophisticated algorithm for smooth tele-operation. A new concept named fuzzy command smoothing algorithm is proposed in this paper in order to provide smooth motion to a tele-operated mobile robot. It gives smooth motion command to the mobile robot from possibly abrupt quick turn motion command of the joystick using fuzzy logic. Simulation results verify the usefulness of the proposed algorithm.