• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.492-504
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• 2005

본 신 재생에너지설비 시공 및 설치확인 기준 연구는 신재생에너지 시스템의 효율적인 보급과 사후관리 비용 절감 및 성능향상으로 인한 에너지 생산을 효과적으로 할 수 있게 될 뿐 만 아니라 보급확대를 위해서는 필수적으로 있어야 할 기준이다. 현재 보급사업으로 추진되고 있는 5개 에너지원에 대한 설비 시공 및 설치확인 기준을 작성하여 보급사업의 지침서 역할을 하도록 하였다. - 태양열 시스템 시공 및 설치확인 기준 개발 - 지열이용 시스템 시공 및 설치확인 기준 개발 - 태양광발전 시스템 시공 및 설치확인 기준 개발 - 풍력발전 시스템 시공 및 설치확인 기준 개발 - 소수력발전 시스템 시공 및 설치확인 기준 개발

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.942-945
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• 2010

The development of decentralized power has appeared as part of an effort to decrease the energy loss and the cost for electric power facilities through installing small renewable energy generation systems including solar and wind power generation. Recently a new era for decentralized power environment in building is coming in order to handle the climatic and environmental change occurred all over the world. Especially solar and wind power generation systems can be easily set up and are also economically feasible, and thus many industrial companies enter into this business. This paper suggests the overall architecture for the decentralized renewable power system and the prediction method of power on climatic change. The ultimate goal is to help manage the overall power efficiently and thus provide the technological basis for achieving zero-energy house.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.35 no.3
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• pp.57-66
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• 2023

In order to understand the economic feasibility of an offshore wind farm, this paper analyzed the differences in LCOE (levelized cost of energy) according to the support type and construction method of the substructure in terms of LCOE and sensitivity analysis was conducted according to the main components of LCOE. As for the site to be studied, the Southwest Offshore Wind Farm was selected, and the capital expenditures were calculated according to the size of the offshore wind farm and the installation unit. As a result of the sensitivity analysis, major components showed high sensitivity to availability, turbine related cost, weighted average cost of capital and balance of system related cost. Moreover, the post-piling jacket method, which was representatively applied to the substructure of the offshore wind farm in Korea, was selected as a basic plan to calculate the capital expenditures, and then the capital expenditures of the pre-piling jacket method and the tripod method were calculated and compared. As a result of analyzing the LCOE, it was confirmed that the pre-piling jacket method of the supporting structure lowers the LCOE and improves economic feasibility as the installation number of turbines increases.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.2
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• pp.142-149
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• 2004

This paper presents a neural network controller of a grid-connected wind energy conversion system for extracting maximum power from wind and a power controller to transfer the maximum power extracted into a utility grid. It discusses the modeling and simulation of the wind energy conversion system with the controllers, which consists of an induction generator, a transformer, a link of a rectifier, and an inverter. The paper describes tile drive train model, induction generator model and grid-interface model for dynamics analysis. Maximum power extraction is achieved by controlling the pitch angle of the rotor blades by a neural network controller. Pitch control method is mechanically complicated, but the control performance is better than that of the stall regulation. The simulation results performed on MATLAB show the variation of the generator torque, the generator rotor speed, the pitch angle, and real/reactive power injected into the grid, etc. Based on the simulation results, the effectiveness of the proposed controllers is verified.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.8
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• pp.18-25
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• 2008

The paper presents a modeling of the grid-connected wind turbine generation system on MATLAB/Simulink and aims to perform simulations for analysis of the system's characteristics. It performs a pitch regulation for control of the wind generator's output with respect to wind speed variation, and presents a relationship between interconnecting transformer's connections and fault current by reviewing the variations of fault current according to transformer connections in a grid-connected wind power generation system. It also investigates the effect of grounding methods of the interconnecting transformer's neutral point on fault current variations. The simulation results show the differences of fault currents, voltages and generator's characteristics for a line-to-ground fault according to interconnecting transformer's four different connections, and the differences of fault currents of the system according to grounding methods of the transformer neutral point. Therefore, the case studies demonstrate the effectiveness of the proposed simulation model on Simulink.

• 전기산업
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• v.8 no.3
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• pp.90-97
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• 1997

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.25 no.4
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• pp.187-193
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• 2013

Thanks to the characteristic of high-rise buildings, the increase of wind speed according to the height of a building makes it possible to use high wind power resources, many countries led by some advanced nations are recently making steady and persistent effort in introducing small wind turbine systems as a step to lower electric power load in high-rise buildings. The aim of this research is to propose an optimum application process of a small wind turbine system in high-rise buildings. To achieve this goal, the case studies on the applications of high-rise and tall buildings were conducted and the best application among them was selected. On the basis of the case studies, an application process was proposed.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.2
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• pp.124-130
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• 2005

This paper presents the simulation modeling and analysis of variable wind speed turbine system(VWTS) using Psim program In the simulation, using the Vestas V47 VWTS located in Hangwon wind farm in Jeju-Do as a model, wind model, blade model, pitch control model and grided connected generator are modeled. The VWTS is controlled by the optimal pitch angle for maximum output power under the rated wind speed and for the rated output power over the rated wind speed. To verify the effectiveness of proposed method, simulation results are compared with the actual data from the model system According to the comparison of these results, this method shows excellent performance. So it is very useful for understanding and applications of wind power control system.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2069-1-2070-1
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• 2008

산업자원부에서는 국가에너지사업의 정책으로 지역 에너지사업 및 신 재생에너지 시범보급사업을 수행하고 있으며, 이에 따라 대규모 신재생에너지전원(태양광, 풍력, 열병합 등) 단지가 활발하게 조성되고 있는 상황이다. 그러나 신재생에너지전원의 설치자 측에서는 설비비용의 절감을 이유로 일반배전선로(고압 및 저압배전선로)에 직접적인 연계를 요구하고 있으나, 한전 측에서는 계통운용의 어려움으로 인하여 까다로운 계통연계지침(가이드라인)을 정하여, 한전 측과 전기사업자(전기공사업자 및 발전 사업업자)간의 이해가 상충되는 부분이 발생하고 있는 실정이다. 따라서 본 연구에서는 신재생에너지전원의 발전업자와 전기공사업자의 측면에서는 효율적인 공사 및 시공을 위하여, 배전계통 연계와 관련된 복잡한 기술적인 계통연계 지침을 일일이 해석하지 않더라도, 연계 적합여부를 손쉽고 자동적으로 판단해주는 평가시스템을 개발하였다.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.427-428
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• 2013

풍력발전과 같은 분산전원이 계통에 연계되어 운전될 경우, 계통연계 규정에 따라 운전해야 한다. 특히 계통사고에 의해 계통과 분리되었음에도 불구하고, 지속적으로 운전하는 것을 단독운전 이라 한다. 이러한 단독운전은 전기설비의 손상을 일으킬 수 있으므로 계통연계 규정에 따라 이를 빠르고 정확하게 검출하여야 한다. 본 논문에서는 이러한 단독운전을 검출하기 위해서 NDZ(Non-Detecton Zone)를 갖지 않는 고조파 주입 기법의 새로운 고조파 계산 및 검출 알고리즘 제안한다.