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하이브리드 변압기 회로 모델링을 적용한 전력계통연계형 태양광발전 시스템의 고조파 영향 분석
오진택(Jin-Taek Oh),이재호(Jae-Ho Rhee),고광철(Kwang-Cheol Ko) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.1
The hybrid transformer is developed for not only boosting voltage but also removing harmonic in 2009. So far researches for hybrid transformer have been done about study of only operation characteristic or analysis by using simulation of grid mainly. In this paper, we modeled the hybrid transformer and analyze its effect in real power grid. For verifying reduction of harmonic, we modeled the grid-connected photovoltaic generation system, which is typical eco-friendly generator, as a harmonic source. Hybrid transformer, a transformer with Zig-Zag winding, is used in analyzing the phase change between input and output voltage when the winding direction of the transformer is altered. Also, the harmonic content of source is analyzed depending on the existence of hybrid transformer. As a result, it can be seen that the hybrid transformer reduces the harmonic content by 9%.
하이브리드 변압기의 2차측 위상각 변화에 따른 고조파 저감 효과 분석
오진택(Jin-Taek Oh),이재호(Jae-Ho Rhee),고광철(Kwang-Cheol Ko) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.8
The phase shifts in the Zig-Zag windings can be used in reducing the harmonic components. To obtain the optimum hybrid transformer design, it is required to analyze the harmonic reduction rate over phase shifts in Zig-Zag windings. The photovoltaic systems are used as a harmonic source in analyzing the harmonic reduction effects of the hybrid transformer. Each phase shifts in the secondary windings of the hybrid transformer is set to 15°, 30°, 45°, 60°. From the results, it was found that the reduction rates of the hybrid transformer has maximum values when the phase shifts is 60° and has minimum values when the phase shifts is 30°. By comparing the case of 60° phase shift with the 30° phase shift, it can be seen that the reduction rates in 5th, 7th, 11th, and 13th harmonics increases by 0.84%, 1.98%, 4.12%, and 5.9% respectively. It was also found that the reduction rates increases as the order of the harmonics increases.
배전계통 연계형 태양광발전 시스템의 계통연계 하이브리드 변압기 적용에 따른 고조파 저감 시뮬레이션 분석
오진택(Jin-Taek Oh),이재호(Jae-Ho Rhee),고광철(Kwang-Cheol Ko) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.4
As the power trading system diversifies and the amount of power generated by the photovoltaic power generation system increases due to its increased efficiency, the number of photovoltaic power generation system connected to power system is on a rising tendency. The harmonic components, produced in the process of connecting the photovoltaic power generation system to the power system, decrease the power quality of the power system and cause malfunctioning on the measuring devices. In this paper, the reduction of harmonic components are simulated using hybrid transformer instead of grid-connected transformer. The hybrid transformer has zig-zag windings and the voltage phase is shifted about 30 degrees. The hybrid transformer is modeled to have the transformation ratio of 370V / 22,900V. Through the simulation, it can be seen that the harmonic components on the voltage is reduced by min. 2% and the harmonic components on the current is reduced by min. 15%. Therefore, the hybrid transformer can be used in protecting the power system from the harmonic components of the photovoltaic power generation system.
정봉부(Bong Bu Jung),오진택(Jin Taek Oh),박현철(Hyun Chul Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Rollers are used widely in the transfer of the steel plate in steel mills. This method causes very loud impact noise because of the deflection of the steel plate. In this paper, a method for reducing the impact force was implemented in order to reduce the impact noise. The noise index was introduced to quantify the relation between impact noise and impact force. Dynamic and impact analyses were carried out using the finite element method. Experiments on impact were also carried out in order to validate the results.
충격 시 진동에 의한 방사 소음의 예측 기법에 관한 연구
정봉부(Bong Bu Jung),오진택(Jin Taek Oh),박현철(Hyun Chul Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Impact noise caused by the collision of bodies is difficult to estimate because of the complexity of impact phenomenon. In this study, impact noise is estimated using two different methods when the noise is caused by the vibration due to impact. First, impact noise is analyzed using impact analysis and boundary element analysis. Second, modal expansion technique is applied to the estimation of impact noise. Experiment is carried out to validate the analysis results.
해상풍력 공동접속모선 입지 및 345kV 송전선로 최적 경과지 선정시 중립성 확보를 위한 기준 마련에 관한 연구
정훈(Hoon Jung),고훈(Hoon Ko),노일래(Il-Rea Noh),오진택(Jin-Taek Oh),이일무(Il-Moo Lee) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.8
Recently, as renewable energy has been expanded as a private project, Therefore, there is an irrationality in that the distance of the submarine cable for each power generation company is different depending on the location of the common access bus used by several power generation companies. However, the transitional site selection work promoted by the private sector is inefficient but unsystematic compared to Korea Electric Power Corporation, which has a lot of experience and achievements, and there is a significant lack of objective grounds. Therefore, a neutral and equitable location selection criteria are needed. Accordingly, it reviews the regulations of relevant laws and regulations, determines resistance values and weights, selects an virtual candidate area through the existing Geographic Information System (GIS) and spatial analysis data, and derives the minimum cost through the Transportation Planning Act to determine the optimal transit site. A plan for securing neutrality in selection was presented.