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최연옥,현성복,조금배 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1
The noise of the most industrial universal motor are mainly caused by the electromagnetic effect. This kind of noise can be amplified by the structure itself, if the frequency components of the magnetomotive force are close to the resonance frequencies of the structure. Therefore, there must be an intermediate process which usually called structure dynamic modification to avoid this phenomenon. In order to yield the input forces for the motor, analytical forms of magnetomotive force were obtained and those were feed to do response analysis. Through these analysis, some design guide were suggested to reduce the vibration of the universal motor.
Anti-Windup기법을 이용한 유도전동기의 벡터제어에 관한 연구
최연옥,조금배 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.1
The rotor flux vector is used to calculate the flux angle for coordinate transformation, feed the control signal for d-axis controller and synthesize the de coupling voltage for independent d and q axis currents control. Various methods are developed to find the flux vector of induction motor for direct rotor field oriented control; direct measurement and estimation methods. This paper is on speed control of induction motor using space vector PWM. Vector control which controls independantly flux and torque current component in order to drive induction motor, is applied for driving motor. In this paper, the performance of the proposed anti-windup control is verifed by experimentation under various conditions with an induction motor drive system composed a high speed DSP controlled, an AC-DC-AC converter and induction motor.
태양광 발전시스템의 최대전력추적을 위한 DC/DC 컨버터 제어
최연옥,서진연,장용해,정삼용,조금배 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
Solar energy converters were used to convert the electrical energy from the solar arrays to a stable and reliable power source. The object of this paper is to analyze and design DC/DC converters of different types in a solar energy system in order to investigate the performance of the converters. A simple method which combines a discrete time control and a PI compensator is used to track the maximum power point of the solar array. The system is kept to operate close to MPPT's thus the maximum possible power transfer from the solar array is achieved. Experimental tests were carried out for buck, boost and buck-boost converters using a simple maximum power point tracking algorithm.
최연옥,이열선,서진연,한승조,조금배 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1
A complete computerized system for the characterization and performance testing of photovoltaics(PV) modules under natural sunlight and ambient condition was designed. I-V characteristics of PV module provides on essential diagnostic means in assessing the performance and internal cell parameters of PV module depends on its basic materials, manufacturing technology and operating environmental conditions. I-V curves derived from PV modules refect to a large extent the physical properties and their expected performance. In this paper, Electrical performance measurement and evaluation methods for solar cell module by MOSFET variable Load were studied. Also, Mathematical model and theory of solar cell associated with the photovoltaic effect has been discribed.
최연옥,정병호,조금배 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.1
In this paper, a direct torque control(DTC) method of an induction motor is proposed which enables constant switching frequency. The switching strategy of a conventional direct torque control scheme which is based on hysteresis comparator results in a variable switching frequency which depends on the speed, flux, stator voltage and hysteresis band of the comparator. This paper proposes a new switching strategy which determine the effective switching time on each switching period by comparing the ascending and descending torque slopes. The simulation results are presented to verify this proposed scheme.
최연옥,조금배 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
A single-phase PWM current source rectifier with a neutral leg is presented and throughly analyzed in this paper. This novel topology is implemented by adding an extra leg a step-down single phase PWM space vector modulation method to reduce the dc output voltage harmonics. The PWM pattern generation need a digital system. As compared with a conventional single-phase PWM rectifier, over 20% improvement of the total harmonics distortion in the output voltage can be obtained. Different SVM techniques are analyzed for this PWM rectifier and simulation results are presented.
확장된 칼만필터를 이용한 유도전동기의 센서리스 벡터제어
최연옥,정병호,조금배 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1
Using Observer, on the sensorless vector control system is a novel techniques for modern induction motor control. In this paper, a speed estimation algorithm of an induction motor using an extended kalman filter was proposed. Extended kalman filter can solve the problem, that have steady state error of estimated speed in flux and slip estimation method. The extended Kalman filter is employed to identify the speed of an induction motor and rotor flux based on the measured quantities such as stator current and DC link voltage. In order to confirming above proposal, computer simulation carried out control drives for using Matlab Simulink and show the effectiveness of the control drives for induction motor speed estimation.
최연옥,조금배 조선대학교 전자정보통신연구소 1999 電子情報通信硏究所論文誌 Vol.2 No.1
The results of an investigation performed for the purpose of developing an adaptive state-of-charge indicator for use in estimating reserve-time during a battery discharge are discussed. A dimensional analysis on the discharge characteristics of AT&T Lineage^(Tm) 2000 Round Cells in the useful range of discharge led to the identification of the relevant physical variables and constants needed to describe the discharge behavior quantitatively. This analysis provided the basis for the proposed algorithm which involves analyzing actual discharge behavior in real-time accordingly. The proposed algorithm was tested with actual discharge data from constant current and variable current discharges.
최연옥,이상인,Choi, Yeonok,Lee, Sangin 한국통계학회 2021 응용통계연구 Vol.34 No.5
본 논문은 확률적 자료연계 방법의 기본 개념과 이론적 모형을 소개하고, 실제 통계청 데이터를 사용하여 확률적 자료연계가 진행되는 과정과 원리를 보여준다. 먼저 확률적 자료연계와 결정적 자료연계와의 차이를 간단히 알아보고, 확률적 자료연계 방법론의 토대가 되는 Fellegi-Sunter 모형의 기본 구성과 관련된 모수(m-확률, u-확률), 가중치, 매치여부 판정기준에 대해 기술한다. 그리고 통계청 등록센서스와 인구총조사 자료를 이용하여 그 모형을 적용한 자료연계가 이루어지는 구체적인 과정에 대해 설명하고, 이를 통해 얻어진 연계 결과의 정확성을 살펴본다. This paper aims to introduce the basic concept of probabilistic record linkage and its statistical framework, and describe the specific process and principle of performing it using a real example from Statistics Korea. First, we briefly describe the deterministic record linkage and compare it with probabilistic record linkage. We introduce the Fellegi-Sunter model framework for record linkage and the related paprameters: m-probability, u-probability, matched weight and decision rule. Finally, we show the detailed process of record linkage under Fellegi-Sunter model framework and evaluate the record linkage results, using sample data from the registered-based census and Population and Housing Census survey in Statistics Korea.