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김석균,이영일,송화창,김정수,Kim, Seok-Kyoon,Lee, Young Il,Song, Hwachang,Kim, Jung-Su Institute of Control 2013 제어·로봇·시스템학회 논문지 Vol.19 No.4
The complexity and severe nonlinearity of multi-machine power systems make it difficult to design a control input for voltage regulation using modern control theory. This paper presents a model-based PID control scheme for the regulation of the bus voltage to a desired value. To this end, a fourth-order linear system is constructed using input and output data obtained using the TSAT (Transient Security Assessment Tool); the input is assumed to be applied to the grid through the STATCOM (STATic synchronous COMpensator) and the output from the grid is a bus voltage. On the basis of the model, it is identified as to which open-loop poles of the system make the response to a step input oscillatory. To reduce this oscillatory response effectively, a model-based PID control is designed in such a way that the oscillatory poles are no longer problematic in the closed loop. Simulation results show that the proposed PID control dampens the response effectively.
쌍선형 시스템의 추종 성능 강화를 위한 예측 제어 알고리즘
김석균(Seok-Kyoon Kim),김정수(Jung-Su Kim),이영일(Youngil Lee) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.3
This paper presents a method to enhance tracking performance of an input-constrained bilinear system using MPC (Model Predictive Control) when a feasible tracking control is known. Since the error dynamics induced by the known tracking control is asymptotically stable, there exists a Lyapunov function for the stable error dynamics. By defining a cost function including the Lyapunov function and describing tracking performance, an MPC law is derived. In simulation, the performance of the proposed MPC law is demonstrated by applying it to a converter model.
Seok-Kyoon Kim(김석균),Young Il Lee(이영일),Hwachang Song(송화창),Jung-Su Kim(김정수) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.4
The complexity and severe nonlinearity of multi-machine power systems make it difficult to design a control input for voltage regulation using modern control theory. This paper presents a model-based PID control scheme for the regulation of the bus voltage to a desired value. To this end, a fourth-order linear system is constructed using input and output data obtained using the TSAT (Transient Security Assessment Tool); the input is assumed to be applied to the grid through the STATCOM (STATic synchronous COMpensator) and the output from the grid is a bus voltage. On the basis of the model, it is identified as to which open-loop poles of the system make the response to a step input oscillatory. To reduce this oscillatory response effectively, a model-based PID control is designed in such a way that the oscillatory poles are no longer problematic in the closed loop. Simulation results show that the proposed PID control dampens the response effectively.
산발적인 데이터를 이용한 HIV 변이모델의 파라미터 추정
김석균(Seok-Kyoon Kim),김정수(Jung-Su Kim),윤태웅(Tae-Woong Yoon) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.8
The HIV (Human Immunodeficiency Virus) causes AIDS (Acquired Immune Deficiency Syndrome). The process of infection and mutation by HIV can be described by a 3rd order state equation. For this HIV model that includes the dynamics of the mutant virus, we present a parameter estimation scheme using two state variables sporadically measured, out of the three, by employing a genetic algorithm. It is assumed that these non-uniformly sampled measurements are subject to random noises. The effectiveness of the proposed parameter estimation is demonstrated by simulations. In addition, the estimated parameters are used to analyze the equilibrium points of the HIV model, and the results are shown to be consistent with those previously obtained.
수정한 전압방정식을 이용한 발전기의 입출력 귀환선형화 제어기 설계
김석균(Seok-Kyoon Kim),윤태웅(Tae-Woong Yoon) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
This paper presents a SISO nonlinear controller for the power system consisting of a synchronous generator connected to an infinite bus. The proposed controller is based on input-output feedback linearization, with a modified version of the terminal voltage equation used as the output. The resulting closed-loop has no internal dynamics, and thus stability is guaranteed. The controller performance is seen to be effective through simulations.
육각형 입력제약 공간을 이용한 무정전 전원장치의 모델예측제어
김석균(Seok-Kyoon Kim),김정수(Jung-Su Kim),이영일(Young Il Lee) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.2
Using the classical cascade voltage control strategy, this paper proposes an analytical solution to an MPC (Model Predictive Control) problem with a hexagonal input constraint set for the inner-loop to regulate the output voltage of the UPS (Uninterruptible Power Supply). Focus is placed on how to deal with the hexagonal input constraint set without any approximation. Following the conventional cascade voltage control strategy, the PI (Proportional-Integral) controller is used in the outer-loop in order to regulate the output voltage. The simulation results illustrate that the capacitor voltage rapidly goes to its reference in a satisfactory manner while keeping other state variables bounded under an unexpected load changes.
불확실한 1기 무한모선 전력 계통의 수동성 기반 적응제어
김석균(Seok-Kyoon Kim),윤태웅(Tae-Woong Yoon) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
In this paper, an adaptive passivity based excitation and governor control scheme is proposed to enhance the transient stability of a single machine infinite bus power system with parametric uncertainties. We employ a state model where the frequency, the difference between active and mechanical power, and the difference between the squared terminal voltage and its reference are regarded as state variables. Using this state model, the proposed controller is obtained in two steps; firstly, a simple direct adaptive passivation controller is designed for the power system with parametric uncertainties; then a linear PI controller is applied to guarantee the stability of the closed loop system.
1기 무한모선 전력계통의 적응 전압 제어와 거버너를 이용한 주파수 진동의 억제
김석균(Seok-Kyoon Kim),윤태웅(Tae-Woong Yoon) 대한전기학회 2008 정보 및 제어 심포지엄 논문집 Vol.2008 No.1
In this paper, we propose two control schemes. The first control scheme is an adaptive passivity-based excitation control which regulates the terminal voltage to its reference. This controller is obtained through two steps: firstly, a simple direct adaptive passivation controller is designed for the power system with parametric uncertainties; then a linear PI controller is applied to converge the terminal voltage to its reference. The second control scheme is a linear governor control which consists of the frequency and the mechanical power. It is shown that the internal dynamics are locally stable with controllable damping. In the end, the boundness of all electrical variables, the frequency. the mechanical power. and the convergence of the terminal voltage to its reference can be achieved by these control schemes.
관측기 기반 온라인 자가동조 선형운동 도립진자 위치제어
김용훈(Younghun Kim),김동수(Dong Soo Kim),김석균(Seok-Kyoon Kim) 제어로봇시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.7
This study presents an observer-based positioning technique with online self-tuning capability for linear motion inverted pendulum systems. The true system parameter values are not required to implement the control algorithm. The observers for estimating the linear and angular velocities do not use the system parameter information, nominal or otherwise. The online self-tuning mechanism adjusts the closed-loop cut-off frequency during the transient periods. The resulting benefits are verified numerically using MATLAB’s Simulink software.