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최인규,우주희,손기헌,Choi, Inkyu,Woo, Joohee,Son, Gihun Korea Electric Power Corporation 2019 KEPCO Journal on electric power and energy Vol.5 No.3
The steam turbine used in nuclear power plant is modeled for the purpose of verification of control system rather than the operator education. The valves, reheater and generator are modeled also and integrated into the simulator. After that, the operation data and the designed data such as heat balance diagram are utilized to identify the model parameters. It was evident that model outputs of developed simulator are very close to the measured operating ones. The simulator within dynamic model was used to verify and validate the whole control system together with field instruments. And the target plant has been operating long time.
다변수 제어성능 최적화를 위한 유전자 알고리즘 기반 발전소 PID 제어 파라미터 튜닝 기법
윤수용(SooYong Yun),이학성(Hak-Sung Lee),우주희(JooHee Woo),변승현(Seung-Hyun Byun),최인규(InKyu Choi),이주현(JooHyun Lee),서인용(In-Yong Seo) 대한전기학회 2020 전기학회논문지 Vol.69 No.1
PID controllers are widely used in the power plant control system. Generally, to calculate PID control parameters, the dynamic characteristics should be identified by investigating the variation of the process value according to the variation of the controller output. Based on this characteristics, several tuning methods can be applied to minimize the cumulative error based performance index. The applicability of ITAE(Integral Time Absolute Error) tuning method which has been studied for decades is determined by the range of time-delay/time-constant ratio. By using this method the fast rising time can be expected, but overshoot and oscillation are inevitable. These effects may lead to shorter life spans of the power plant materials because of excessive movement of the parts. To solve these problems, this paper proposed a PID tuning technique that minimizes cumulative error and overshoot simultaneously by applying genetic algorithm. The performance of the proposed PID tuning technique was verified using power plant simulator, and the performance was excellent compared with ITAE tuning method.
최인규(Inkyu Choi),김종안(Jongan Kim),우주희(Joohee Woo),변승현(Seunghyun Byun),신만수(Mansu Shin) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The power plants have been large-scaled. The characteristics of the protection systems of large scale power plants are much different from those of small or medium scale power plants for such reasons as that the intermediate pressure steam turbine is used instead of the high pressure steam turbine during startup period. While the protection system of large scale power plant can reduce the start-up time compared to that of small or medium scale power plant, the control algorithm and operation method are very complicated. This paper reviews the turbine protection systems of large scale power plants for stable retrofit of turbine control system.
최인규(Inkyu Choi),정창기(Changki Jeong),김병철(Byoungchul Kim),김종안(Jongan Kim),우주희(Joohee Woo) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The thermal energy from nuclear fission is transferred to the steam generator which is a kind of a large heat exchanger. After the feedwater is injected into the steam generator and absorbs the thermal energy, it is converted into the steam. This steam goes into the turbine. The balance between the generated energy and the consumed energy is required for the nuclear power plant to be stable. For the purpose of which, the feed water, a parameter for energy transfer, should be controlled in stability. Usually, the nuclear power plants are operated in base load in the view of power system for the stability of fission system. Therefore, though there will be almost no unbalance, there can be some instability from unbalance in case of startup/shutdown or disturbance. In this case, the controllability of feed water pump is very important for the quick recover of stability.