제주지역 제 3 연계선 도입을 위한 MMC-HVDC 시스템 모델링

Abstract

Wind power is now one of the most promising resources in renewable energy. However, it has to be limited to install the wind turbines because the power system can be negatively influenced by a variable and uncertain nature of the wind energy. This paper presents a method for calculating the wind power marginal capacity in Jeju Island in 2020. A MMC-HVDC system is suggested to increase the capacity of wind farms. The advantages of the MMC-HVDC system over other VSC-HVDC system are low harmonic, large power capacity and high reliability. For the computer simulations, MMC-HVDC, wind farm, thermal plants and STATCOMs are modeled. To analyze the effect of the MMC-HVDC system to the wind farm in Jeju Island, three kinds of scenario are applied to the simulation by using PSCAD/EMTDC program. 1) 400 MW wind farm is in an unexpected fault from the Jeju power grid 2) the steady state operation under the variable speed wind 3) black-start by using MMC-HVDC system under the blackout in Jeju power system These studies will be useful to analyze the quality of Jeju power system considering the effects of MMC-HVDC system at the wind farm. Moreover, the MMC-HVDC system which will be installed in Jeju Island in 2020 is also an effective method to increase the reliability of the Jeju power system with large scale wind farms.