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국내의 시간에 따른 수평면전일사량 상관식 제안 및 정확성 평가(I)
김하양,김정배 한국신·재생에너지학회 2016 신재생에너지 Vol.12 No.S1
Recently, several studies have been conducted to show how the horizontal global solar radiation in Korea can bepredicted using the Zhang-Huang (ZH) model proposed in 2002 for China. Previous results showed that that Cloud-cover RadiationModel (CRM) is unsuitable for Korea. Therefore, this study first corrected the coefficients of the ZH model to make it applicable toKorea and showed that ZH fitted model could make a prediction. This work added a term with the duration of sunshine as beingclosely related to the hourly solar radiation in Korea into the ZH model. Finally, this study proposed a new model to predict the hourlyand daily total solar radiation for all regions, various seasons, and various weather conditions, including overcast and clear, withhigher accuracy and lower error than other models proposed in Korea.
경제성 평가를 통한 태양광발전기와 연계된 배터리 에너지저장장치의 최적 용량 산정
김하양,김수덕,김현구 한국신·재생에너지학회 2019 신재생에너지 Vol.15 No.4
In situations, where the weight of a renewable energy certificate (REC) for a battery energy storage system (BESS) linked to a photovoltaic (PV) system is applied, it is necessary to evaluate the optimal capacity of the BESS to maximize the profit and prepare for a change in future support policy. The levelized cost of energy (LCOE) was calculated for a range of conditions using the hourly power generation data and charge/discharge guidelines of the nationwide PV plants. As a result, the optimal capacity of BESS under the current REC weight 5.0 was determined to be 2.7 times that of the PV capacity nationwide. In the reference cases of Jeju, Gyeongnam, and Jeonnam, which have the lowest, average, and highest solar radiation of the country, it was confirmed that the economic benefit by BESS linkage was higher in cases of lower solar radiation. If the REC weight is downgraded in the future, the optimal capacity of BESS will also be reduced. If there is no reduction in the BESS facility unit cost, the advantage of the REC weighted value of 3.5 or less will be lower than that of a PV single operation.
김하양(Hayang Kim),김민정(Minjung Kim),김경애(Kyungae Kim),김진태(Jintae Kim),이승준(Seungjun Lee) 한국방송·미디어공학회 2004 한국방송공학회 학술발표대회 논문집 Vol.2004 No.-
Wireless sensor network을 위한 MAC(Medium Access Control) layer를 low-rate WPAN을 목적으로 한 IEEE 802.15.4 사양에 따라 구현하고 검증하였다. 센서 네트워크의 노드는 배터리로 동작하므로 에너지 소모가 가장 큰 걸림돌이 된다. power saving을 위한 몇 가지 방법을 포함한 IEEE 802.15.4 MAC protocol을 구현함으로써 wireless sensor network에 적용 가능함을 보였다.
2012년 기상관측 결과와 한국형 수평면전일사량 예측식(I)
김하양(Kim Ha-Yang),김정배(Kim Jeongbae) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.1
To well design the solar energy system, the correlation to calculate and predict solar irradiation is basically needed. So, this study was performed to reveal the relationships between the solar irradiation and four meteorological observation data(dry-bulb temperature, relative humidity, duration of sunshine, and amount of cloud) that didn"t show from previous any other researches. And then, we finally proposed the various order non-linear correlation from the measured solar irradiation and four meteorological measurement data using MINITAB. To show the deviation and accuracy of the solar irradiation between measured and calculated, this study compared for the daily total solar insolation. From those results, the calculation error could well predicted about maximum 97% for the daily total solar insolation. But, the coefficients of the proposed correlations didn"t show any relationships. So, needs more studies to make the proper one correlation for the country.
국내의 시간에 따른 수평면전일사량 상관식 제안 및 정확성 평가(Ⅰ)
김하양(Ha-Yang Kim),김정배(Jeongbae Kim) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.S2
Recently, several studies have been conducted to show how the horizontal global solar radiation in Korea can be predicted using the Zhang-Huang (ZH) model proposed in 2002 for China. Previous results showed that that Cloud-cover Radiation Model (CRM) is unsuitable for Korea. Therefore, this study first corrected the coefficients of the ZH model to make it applicable to Korea and showed that ZH fitted model could make a prediction. This work added a term with the duration of sunshine as being closely related to the hourly solar radiation in Korea into the ZH model. Finally, this study proposed a new model to predict the hourly and daily total solar radiation for all regions, various seasons, and various weather conditions, including overcast and clear, with higher accuracy and lower error than other models proposed in Korea.
국내 기상 측정결과를 이용한 일사량 예측 방법 기초 연구
황보성,김하양,김정배,Hwangbo, Seong,Kim, Hayang,Kim, Jeongbae 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.2
To well design the solar energy system using solar energy, the correlation to calculate solar irradiation is basically needed. So, this study was performed to reveal the relationships between the solar irradiation and four meteorological observation data(dry bulb temperature, relative humidity, sunshine duration, and cloud cover) which are different from previous other researches. And then, we finally proposed the first order non-linear correlation from the measured solar irradiation using four meteorological observation data with MINITAB. To show the deviation of the solar irradiation between measured and calculated, this study compared using the daily total solar irradiance and the maximum peak value. From those results, the calculation error was estimated about maximum 25.4% for the daily total solar irradiance. The error of the solar irradiation between measured and calculated was made from the curve fitting error. So, solar irradiation prediction correlation with higher accuracy can be obtained using 2nd or higher order terms with four meteorological observation data.