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화력 발전소 드럼형 보일러 시스템의 고장 진단을 위한 퍼지 전문가 시스템의 개발
변승현,박세화,Zeungnam Bien 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.10
In this paper, a fuzzy expert system is developed for fault diagnoisis of a drum-type boiler system in fossil power plants. The develped fuzzy espert system is composed of knowledge base, fuzzification module, knowledge base process module, knowledge base management module, inference module, and linguistic approximation module. The main objective of the fuzzy expert system is to check the states of the system including the drum level and detect faults such as the feedwater flow sensor fault, feedwater flow control valve fault, and water wall bube rupture. The fuzzy expert system diagnoses faults using process values, manipulated values, and knowledge base which is built via interviews and questionaries with the experts on the plant operations. Finally, the validity of the developed fuzzy expert system is shown via experiments using the digital simulator for boiler system is Seoul Power Plant Unit 4.
변승현,강해수,우주희,이지훈,김덕호,Byun, Seung-Hyun,Kang, Hae-su,Woo, Joo-Hee,Lee, Jee-Hoon,Kim, Duck-Ho 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.2
Power plant simulators have been used for operator training, control verification and engineering verification. In general, simulators can be used in the place where they are installed by only single user group at a time. Considering high cost of simulator development, a lot of available scenarios, the diversity of user level and accessibility based on users' work location, development of simulator system that can be used by multiple user groups regardless of location is required in order to enhance utilization of simulators. In this paper, the simulator system that can be used by multiple user group simultaneously without location limitation is proposed. The simulator system is composed of simulator servers, database servers, HMI servers, a web server, web clients. Simulator server consists of control model, process model that are developed for Circulating Fluidized Bed power plant located overseas. A web server manages user accounts, operation procedures, multiple server access between web client group and simulator server group. In other words, a web server makes a user group select a simulator server at a time. The developed simulator system is integrated after implementing process model, control model, HMI, and web server. Web client systems are installed on local site where power plant is located, while simulator servers, HMI servers, database servers, and a web server are located in KEPCO RI. The developed simulator system is verified by steady-state test, malfunction test and so on via remote access.
발전소 시뮬레이터를 위한 고압 터빈 바이패스 압력 제어 모델 개발
변승현,이주현,임익헌,Byun, Seung-Hyun,Lee, Joo-Hyun,Lim, Ick-Hun 한국시뮬레이션학회 2011 한국시뮬레이션학회 논문지 Vol.20 No.4
국산 개발 분산 제어시스템의 발전 설비에의 적용을 위해서는 시뮬레이터를 이용한 제어 시스템의 기능 및 신뢰성 등의 검증이 선행되어야만 한다. 본 논문에서는 제어 시스템 검증용 시뮬레이터를 개발하는데 있어서, 제어 모델 중 발전소 기동 초기에 보일러 압력을 조절하고, 정상 운전 중 보일러의 과대 압력 상승을 방지하기 위해 보일러에서 발생한 증기를 복수기로 방출하는 터빈 바이패스 계통의 제어 모델을 개발하였다. 제어 모델 개발을 위해, 통합 시뮬레이션 개발 환경에서 활용가능한 제어 로직 구현 툴을 개발하였다. 또한 개발한 툴의 기능은 개별 기능 블럭의 설계 사양에 기반한 시뮬레이션에 의해 검증을 하였으며, 개발한 툴을 이용하여 고압 터빈 바이패스 계통의 압력 제어 로직을 구현하였다. 500 MW급 표준 석탄화력 발전소 공정 모델과 보일러 제어 모델, 터빈 제어 모델 등 타 계통의 제어 모델과의 연계를 통한 통합 시뮬레이션을 통해 개발한 제어 모델의 효용성을 확인하였다. It is required that a developed control system should be verified using simulator in terms of functionality and reliability prior to application to a power plant that is a very critical facility in the industry. In this paper, the control model for turbine bypass system was developed for power plant simulator. In order to develop the control model for turbine bypass system, the tool that can be used to implement turbine bypass control logic was developed based on the turbine bypass control system manual. The developed tool was merged into the simulator development environment. The functionality of the developed tool was verified via the simulation based on the each function block specification. The HP turbine bypass pressure control logic was implemented using the developed tool and was integrated with process models and other control models such as boiler control model, turbine control model and boiler feed water pump turbine control model for 500 MW korean standard type fossil power plant. Finally, the validity of the developed control model was shown via simulation result under the integrated simulation environment.
Nd₃Ba_(5)NiAl₃O_(15) 상의 합성과 Rietveld 법에 의한 결정구조 정밀화
변승현,신진현,이재열 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2
Nd₂O₃, BaCO₃, NiO, Al₂O₃를 출발물질로 하여 새로운 Nd₃Ba_(5)NiAl₃O_(15) 상을 고상반응법에 의하여 합성하였다. 반응 온도는1250 ℃로 하였고 열처리 중 반복적인 혼합을 실시하였다. Nd₃Ba_(5)NiAl₃O_(15) 상의 결정구조는 분말 X-선회절 법에 의한 데이터를 Rietveld 법을 이용하여 정밀화하였다. 출발 모델은 Nd_(3.43)Ba_(4.42)Co_(2.23)Al_(1.77)O_(15) 의 결정구조를 따랐고 공간군 P6₃mc(186), 격자상수 a = 11.5518(4)Å, c = 6.9706(3)Å. 최종 신뢰도 R 값은 R_(wp) = 0.19.2, R_(p)=0.150으로 나타났다. 이 상의 결정구조는 Ni^(Ⅵ)Al^(Ⅳ)₃O_(15)클러스터로 구성되어있고 이 클러스터는 Ni^(Ⅵ) 육면체가 3개의 Al^(Ⅳ) 사면체와 corner sharing 하는 형태를 보인다. The new Nd₃Ba_(5)NiAl₃O_(15) phase was synthesized with Nd₂O₃, BaCO₃, NiO and Al₂O₃ by solid state reaction at 1250 ℃ with intermittent grinding. The crystal structure of Nd₃Ba_(5)NiAl₃O_(15) has been refined on X-ray diffraction powder data by means of Rietveld method. The starting model was based on the Nd_(3.43)Ba_(4.42)Co_(2.23)Al_(1.77)O_(15) structure. The crystal system was hexagonal, space group P6₃mc(186), a = 11.5518(4)Å, c = 6.9706(3)Å. Final R values were R_(wp) = 0.19.2 and R_(p)=0.150 The structure consists of clusters of Ni^(Ⅵ)Al^(Ⅳ)₃O_(15) in which a Ni^(Ⅵ) octahedron shares corners with 3 Al^(Ⅳ) tetrahedra.