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단위 DSC셀의 직병렬 연결을 통한 소형 배터리 충전특성에 관한 연구
홍지태(Hong, Ji-Tae),최진영(Choi, Jin-Young),서현웅(Seo, Hyun-Woong),김미정(Kim, Mi-Jeong),심지영(Sim, Ji-Young),김희제(Kim, Hee-Je) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
To elucidate possible challenges for outdoor practical use of dye-sensitized solar cells(DSC), compared with conventional Si solar cells. DSC modules still need the larger area than conventional Si solar modules to attain the same rated output because of lower photoelectron-chemical conversion efficiency. However, using batteries backup systems, the measured data shows that DSCs gathered over 12% more electricity than Si solar cells of the same rated output power in same outdoor condition. Moreover, battery charging time of DSC is about 1 hour faster than same rate of Si solar module. In this paper, 12 single DSC cells prepared for 4 serialized DSC cells was connected in 3 row parallel which have same output power rate of Si solar module. This DSC module was practiced generating characteristic experiment over outdoor daylight condition and applied with PV battery charger by using DC-DC converter. The main advantages of DSC module battery charger as compared with conventional Si solar module one are shorter charge time and lower cost.
염료감응형 태양전지 TiO₂ 광전극 표면의 초음파 열처리에 관한 연구
홍지태(Hong, Ji-Tae),최진영(Choi, Jin-Young),서현웅(Seo, Hyun-Woong),김종락(Kim, Jong-Lak),김희제(Kim, Hee-Je) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Recently, there were many researches for efficiency improvement of DSC. Among of these works, research of surface treatment is still a prerequisite for electron diffusion, light-harvesting and surface state of DSC⁴. Using of the surface treatment, it can be raise up porosity of TiO₂ nano-crystalline structure on photo-electrode<sup>5</sup>. There are chemical, physical, electrical and optical methods which raise up its porosity. In this paper, we have designed and manufactured MOPA-type ultrasonic circuit (100W, frequency and duty variable). Manufactured ultrasonic circuit to use to force cavity density and power into TiO₂ paste. Then, we have optimized forcing time, frequency and duty of ultrasonic irradiation for surface treatment of photo-electrode of DSC. In I-V characteristic test of DSC, ultrasonic and thermal treated DSC shows 19% improved its efficiency against established DSC.
Grid faults characteristics simulation of inverter-fed induction generator
홍지태(Hong, Jitae),권순만(Kwon, Soonman),김춘경(Kim, Chunkyung),이종무(Lee, Jongmoo),천종민(Cheon, Jongmin),김홍주(Kim, Hong-Ju),김희제(Kim, Heeje) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
The detail simulation modeling of fully-fed induction generator is investigated through PC based MATLAB/Simulink environment. Generator's stator currents are controlled by indirect vector control method. In this method, generator side converter controls the maximum excitation (air gap flux) by stator d-axis current and controls generator torque by stator q-axis current. Induction generator speed is controlled by tip speed ratio (TSR) upon the wind speed variations in order to generate the maximum output power. The generator torque model is specified as a 3-blade wind turbine with rating, then, the model is simulated under normal operating condition and three different fault conditions. The matlab model designed for fully-fed induction generator based wind farm provides good performance under normal and grid fault conditions. It provides good results for different pwm techniques and fault conditions except the single-phase line to ground fault, which should be verified with real time data from wind farms.