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박재식(Jae-Shik Park),소명옥(Myong-Ok So),오세준(Se-June Oh),유희한(Hee-Han Yoo),박진길(Jin-Gil Park),하주식(Joo-Shik Ha) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
Photovoltaic power generation systems are expected to be widely used becase of their cleanness in the environment. But one of their disadvantages is the unexprected fluctuation of photovoltaic power generated by the weather conditions.<br/> This paper proposes to predict the output fluctuation of photovoltaic power by analyzing clouds through the image processing technique. First, the velocity of the cloud in the image is calculated by the comparison between two sequential images of the cloud, and then, the weather conditions are forecasted by examining the color values of the image along the direction of the cloud movement. Experimental results, the weather forecast 60, 90 and 120 seconds ahead and the estimation of the time required for the solar radiation to fluctuate on a large scale, show the possibility of the prediction of the output fluctuation of photovoltaic power generation system.<br/>
피드포워드 제어와 안티와인드업 기법을 결합한 셀-튜브 열교환기 시스템의 PID 제어
안종갑(Jong-Kap Ahn),소건백(Gun-Baek So),이주연(Ju-Yeon Lee),이윤형(Yun-Hyung Lee),소명옥(Myong-Ok So),진강규(Gang-Gyoo Jin) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.5
In many industrial processes and operations, such as power plants, petrochemical industries and ships, shell and tube heat exchangers are widely used and probably applicable for a wide range of operating temperatures. The main purpose of a heat exchanger is to transfer heat between two or more medium with temperature differences. Heat exchangers are highly nonlinear, time-varying and show time lag behavior during operation. The temperature control of such processes has been challenging for control engineers and a variety of forms of PID controllers have been proposed to guarantee better performance. In this paper, a scheme to control the outlet temperature of a shell and tube heat exchanger system that combines the PID controller with feedforward control and anti-windup techniques is presented. A genetic algorithm is used to tune the parameters of the PID controller with anti-windup and the feedforward controller by minimizing the IAE (Integral of Absolute Error). Simulation works are performed to study the performance of the proposed method when applied to the process.