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신휘범(Hwi-Beom Shin) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.7
An attemperator is a part of the 4-stage superheater in the boiler system of the thermal power plant. The attemperator receives the over-heated steam and makes the steam with proper temperature by adjusting the control valve of the cold steam. In this paper, the attemperator is modeled considering physical point of view and the linearized model is derived for the control purpose. To overcome the integral windup phenomenon due to the opening limitation of the control valve, an anti-windup PI controller is proposed to the attemperator and compared with the PI controller operated in the thermal power plant in view of control performance.
신휘범(Hwi Beom Shin),이정훈(Jung Hoon Lee),정세교(Se Kyo Chung) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
The windup phenomenon appears and results in the performance degradation when the PI controller output is<br/> saturated A new anti-windup PI controller is proposed to improve the control performance of the variable~speed motor drives and it is experimentally applied to the speed control of a vector-controlled induction motor driven by a<br/> pulse width modulated(PWM) voltage source inverter (YSI). The integral state is separately controlled corresponding to whether the PI controller output is<br/> saturated or not. The experimental results show that the speed response has the much improved performances such as small overshoot and fast settling time over the conventional anti-windup technique. Although the operating speed command is changed, the similar control performance can be obtained by using the PI gains selected in the linear region
불연속 전류모드에서의 다상 교호 승압컨버터의 특성 해석
신휘범(Hwi-Beom Shin),장은승(Eun-Sung Jang),정세교(Se-Kyo Chung),이현우(Hyun-Woo Lee) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper presents the generalized and explicit expressions for evaluating the performance of the multi-phase interleaved boost converter in discontinuous inductor current mode. Furthermore, the generalized transfer functions of interest are presented and the dynamic characteristics are analyzed. The generalized analysis of converter performance is verified through the experimental and simulation results.
Analysis of Multi-Phase Interleaved Boost Converter in Discontinuous Inductor Current Mode
신휘범(Hwi-Beom Shin),장은승(Eun-Sung Jang),이현우(Hyun-Woo Lee) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper presents the steady-state characteristics of the multi-phase interleaved converters in discontinuous inductor current mode(DICM). The full-order averaged model is derived, and the conversion ratio and efficiency are presented.
신휘범(Hwi-Beom Shin),이순영(Soonyoung Lee) 대한전기학회 2010 전기학회논문지 Vol.59 No.11
The superheater in the thermal power plant makes the wet steam into the dry steam with high temperature and high pressure by using the boiler heat. The dry steam pressure rotates the turbine-generator system. The efficiency and life time of the boiler heavily depends on the steam temperature regulation. The steam temperature can be deviated from the reference by the MW demand of the power plant. It is therefore required that the PI(proportional-integral) controller should be robust against the disturbance such as the MW demand. In this paper, the PI controller with the integral state predictor is proposed and applied to regulate the steam temperature of the superheater, and it is compared with the conventional PI controller operated in the thermal power plant in view of control performance.
이순영(Soonyoung Lee),신휘범(Hwi-Beom Shin) 대한전기학회 2010 전기학회논문지 Vol.59 No.11
In this paper, the mathematical models of the superheater and the desuperheater are derived based on the fundamental laws of physics, mass and energy balance. The parameters of the models are developed for the 500[㎿] thermal power plant using the actual data. The simulated model outputs are well matched with the actual ones. It is expected that the proposed models are useful for the temperature controller design of the thermal power plant.