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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,서진연,조금배 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2
The main problems in photovoltaic performance measurement arises from the fact that solar cells have a highly selective spectral response and are, therefore, very sensitive to the spectral composition of the incident radiation. Outdoors, this varies considerably with location, weather, time of year and time of day, Indoors, it depends on the type of simulator used and it can change as the equipment ages. Unless measurement procedures take account of these variations and other difficulties, such as the marked temperature dependence of solar cell, the results can be grossly erroneous. Performance rakings of the same module by laboratory have been know to disagree by as much as 20%.
정헌상,정수복,서진연 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1
In the general, the speed control of single-phase induction motor is accomplished at a few discrete speed by using tapped-winding, pole changing or gear. These technique is inefficient and complicated. In the reason, the applied voltage of single-phase induction motor is controlled for improvement speed characteristics. The AC converter can be easily realized using module transistor. The output voltage from the AC converter is applied to single-phase induction motor. This paper presented operating characteristics of single-phase induction motor by AC converter.
김창석,황석영,서진연,정삼용 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.1
This paper describes the proper selection method of the power system stabilizer(PSS) parameter for stabilizing operation of a synchronous machine which connected to infinite bus by using pole assignment method. The purpose of PSS is to enhance the damping capability at small frequency oscillation (0.5∼2㎐). It can be achieved by moving the real part of critical eigenvalue (pole) on left side of s-plane. The PSS parameter was selected by using the proposed method to match with a pre-assigned pole associated with poorly damped swing mode. This method has been studied to synthesize the PSS on Yong-Gwang N/P. And the simulation results show that the selected parameter by using proposed method is effective for dynamic and transient stability of power system.
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.
신경회로망을 이용한 평면좌표계형 로보트구동용 교류서보전동기 제어기
김평호(Kim pyoung-ho),서진연(Seo jin-youn),김대곤(Kim dae-gon),이강연(Lee gang-youn),백형래(Baek hyung-lae) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
This paper describes the controller for the improving speed control the AC servo motor. The microprocessor provides an output to the difference in command. The servo system improves the characteristics of speed control. When the motor is<br/> running at the same speed as set by the reference signal, the speed encoder also provides a signal 0 the same frequency. Thus, the microprocessor controlled digital techniques enable to realize the flexible performance and control which was possible with time constant. We can know that PI control using neural networks by 80196 can control efficiently speed of AC Servo motor. Finally expenmental results prove excellent performance of this control system. The system can be adaptable to CNC machine.