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컨테이너 크레인이 위치제어 및 흔들림 억제를 위한 GA-퍼지 제어기 설계
허동렬,오경근,김창현,안병철,정형환 동아대학교 정보기술연구소 2000 情報通信硏究所論文誌 Vol.8 No.1
In this paper, we design a GA-fuzzy controller for position control and anti-swing at the destination point. Applied genetic algorithm is used to complement the demerit such as the difficulty of the component selection of fuzzy controller, namely, scaling factor, membership function and control rules. Lagrange equation is used to represent the motion equation of trolley and load in order to obtain mathematical modelling. Simulation results show that the proposed control technique is superior to a conventional optimal control in destination point moving and modification.
최적 변조제어기를 이용한 컨테이너 크레인의 안정화에 관한연구
허동렬 한국마린엔지니어링학회 1999 한국마린엔지니어링학회지 Vol.23 No.5
In this paper in optimal modulation controller for position control and anti-sway of container crane systems is designed by a recursive algorithm that determines the state weighting matrix Q of a linear quadratic performance. The optimal modulation controller is based on optimal control. The basic feature of the recursive algorithm is the reduction of the number of iterations as well as minimization of the calculations involved So in order to obtain a mathematical model which rep-resents the equation of motion of the trolley and load Lagrange equation is used. The optimal modulation controller has been verified and simulated to show that it is robust when a load dis-turbance is applied and a reference is changed.
유전알고리즘을 이용한 SVC 계통의 안정화에 관한 연구
허동렬,주석민,이종민,정형환 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
This paper deals with a systematic approach to GA-PI Controller design for static VAR compensator(SVC) using genetic algorithm(GA) to improve system stability. Genetic algorithms(GAs) are search algorithms based on the mechanics of natural selection and natural genetics. To verify the robustness of the proposed method, considered dynamic response of terminal speed deviation and terminal voltage by applying a power fluctuation. Thus, we proved usefulness of GA-PI controller design th improve the stability of single machine-bus with SVC system.
허동렬,정형환,문종익 동아대학교 환경문제연구소 2000 硏究報告 Vol.23 No.1
It is the time-varying dissolved oxygen (DO) dynamics that requires controlling for maintaining the Do concentration in the aeration tank. Many linear controllers have thus been applied. Because of the nonlinearity of the oxygen transfer function together with the time-varying respiration rate, however, the linear controllers are found to poorly perform in many cases. To overcome this limitation, a number of advanced controlling techniques have been developed and applied. In this study, designed GA-PI Controller using genetic algorithm(GA). Genetic algorithms (GAs) are search algorithms based on the mechanics of natural selection and natural genetics. As result of computer simulation, GA-PI controller shows the better control performance especially under the condition of the continuously changing DO set-point. This result represents that GA-PI controller can be a good measure to control the DO concentration in the SBR process which requires the sequential DO set-point change to accomplish the nitrification and denitrification in a single reactor.
GA를 이용한 SVC용 LQ 제어기의 가중행렬 선정 기법
허동렬,이정필,주석민,정형환 한국조명전기설비학회 2002 조명·전기설비학회논문지 Vol.16 No.6
본 논문에서는 정지형 무효전력 보상기에 대한 최적 LQ 제어기의 가중행렬 선정과정을 유전알고리즘을 이용하여 최적의 가중행렬을 결정하는 기법을 제시하였다. FACTS로 분류되는 여러 기기중 고정된 용량의 커패시터와 싸이리스터 제어에 의하여 용량이 가변되는 인덕터가 병렬로 연결된 구조를 가지고 있는 SVC 시스템은 전압을 효과적으로 제어할 뿐만 아니라 동기발전기의 댐핑을 향상시킬수 있다. LQ제어기의 설계는 최적 가중행렬 선정에 의존하므로 본 논문에서는 종래의 일반적인 방법과는 달리, 자연 생태계의 진화를 모의한 전역적 탐색 최적화 기법인 유전 알고리즘을 이용하여 설계하였다. 이에 대해 고유치 해석과 시뮬레이션을 통해 제어성능을 검토하여 우수한 제어 성능을 가지는 제어기를 최적화 기법인 GA에 의해서 설계할 수 있음을 확인하였다 In this paper, we present a GA(Genetic Algorithm) approach to select weighting matrices of an optimal LQ(Linear Quadratic) controller for SVC(Static VAR Compensator). A SVC, one of the FACTS(Flexible AC Transmission System), constructed by a FC(Fixed Capacitor) and a TCR(Thyristor Controlled Reactor), was designed and implemented to improve the damping of a synchronous generator, as well as to control the system voltage Also, a design of LQ controller depends on choosing weighting matrices. The selection of weighting matrices which is not a trivial solution is usually carried out by trial and error. We proposed an efficient method using GA of finding weighting matrices for optimal control law. Thus, we proved the usefulness of proposed method to improve the stability of single machine-infinite bus with SVC system by eigenvalues analysis and simulation.
초고압 직류 송전 시스템에 대한 최적 변조 제어기의 적용 및 제어 특성에 특성에 관한 연구
허동렬,정문규,이종민,정형환 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1
Recently, according to growth of national economy and the improvement of lining conditions, electric power demand is increasing gradually. So it is being examined to construct large thermal power plants or nuclear plants. For the effective use of lands and for the economy of generations sites, the distance between generation and demand locations becomes farther and farther. At the same time, people desire higher quality or electric power. So in this paper, the optimal modulation controller for HVDC transmission system are designed by a recursive algorithm that determines the state weighting matirx Q of a linear quadratic performance. It means that the application of optimal modulation controller in HVDC transmission system can contribute the propriety to the improvement of the stability in HVDC tranmission system.
고토크·비상운전기능을 가진 다상BLDC모터 및 제어기개발
허동렬(Dong-Ryol Hur),황윤길(Yun-Gil Hwang),안기주(Gi-Ju Ahn),박형삼(Hyeong-Sam Park),신동률(Dong-Ryul Shin) 한국정보기술학회 2024 한국정보기술학회논문지 Vol.22 No.3
In this paper, a multi-phase brushless direct current(BLDC) motor is widely used for high efficiency and emergency operation propellants because it operates by distributing the phases of the motor and the controller. In particular, it is used in areas that require high efficiency, safety(Emergency driving), and low noise, such as submarines and electric vehicles. Since the motor winding and controller are made and controlled in multi-phase(n=natural number, 3n), high efficiency is achieved by reducing heat loss, and the concept of emergency operation that operates even when one of the n-phase is finished is designed and implemented in the controller. Reduce torque ripple by minimizing increase in stator winding loss at maximum output torque by multiphase division. The controller implements crime efficiency because it partially controls the excitation, and since phase control is implemented through actual measurement, it does not decrease to the phase loss ratio and is driven by the rest of the phase even after the Korean version is finished, that is, it is excellent in emergency operation is excellent measurement.