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풍력발전기가 연계된 배전계통에서 사고위치 변화에 따른 사고전류 특성 분석
조성훈(Seonghoon Cho),차한주(Hanju Cha) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
최근 신재생에너지 발전 시장은 급격한 성장세를 보이고 있으며, 특히 풍력발전 시장은 2008년 말 이미 120GW 용량의 풍력발전기가 전 세계에 설치되었으며, 이는 2004년말 48GW의 두배 이상에 해당하는 수치이다. 특히, 여러 신재생에너지원 중 풍력발전기는 에너지 변환 효율이 높고, 발전 단가가 싸기 때문에, 앞으로도 다른 신재생에너지원보다 더욱 큰 발전이 기대된다.<SUP>[1]</SUP> 본 논문에서는 PSCAD/EMTDC를 이용하여 2㎿급 이중여자 풍력발전 시스템(DFIG, Doubly-Fed Induction Generator)과 배전계통을 모델링하고 배전계통에서 사고위치 변화에 따른 다양한 고장에 대하여 사례연구를 진행한다.
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조성훈(Seonghoon Cho) 한국계량경제학회 2020 JOURNAL OF ECONOMIC THEORY AND ECONOMETRICS Vol.31 No.2
The natural rate of interest is the real interest rate that would prevail when the macro economy is in its natural, long-term equilibrium at which the actual GDP growth rate equals its potential rate. The natural rate of interest should therefore comove with the long-term trend of the potential GDP growth. In addition, since monetary policy authority has a significant impact on real interest rates, the difference between real and natural interest rates can be the basis for determining the long-term policy stance for the real sector of the economy. This study estimates potential growth rates and natural interest rates in Korea and the United States based on the Holston et al. (2017) model with important adjustments. We use the real market interest rate faced by economic agents, which may be different from the traditional real rate computed using the policy rate. Also, GDP per capita is considered, which is theoretically more suitable when population growth is taken into account. The estimation results using these new measures and the associated adjustment in the model reveal that the estimated natural rate of interest captures the theoretical characteristics of the natural interest rate better than the estimate using standard real interest rate. In addition, since the 2000s, Korea’s real rate was much lower than the estimated natural interest rate, suggesting that the long-term monetary policy stance in Korea might have been strongly accommodating.
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마코프 스위칭을 고려한 DSGE모형의 이론분석 및 한국경제에서의 적용 가능성
유병학 ( Byoung Hark Yoo ),조성훈 ( Seonghoon Cho ) 한국금융연구원 2015 한국경제의 분석 Vol.21 No.2
This paper estimates and studies changes in monetary policy regimes using a Bayesian estimation technique in the context of a small open economy dynamic stochastic general equilibrium(DSGE) model subject to Markov-switching. A DSGE model known as Markov-switching rational expectations(MSRE) model is suitable in study of recurrent regime changes in monetary policy stance or preferences and technologies of private agents following a Markov-process. In this paper, we allow the coefficients of inflation, the output gap, changes in exchange rate and the lagged interest rate to follow a Markov-process in a standard interest rate feedback rule of the Bank of Korea. We let the data reveal which variable the short-term interest rate is more responsive to and how the policy stance has been changed for the period of 1999-2013. The most important contribution of this paper is to conduct an empirical study for the Korean economy using a MSRE model. The empirical evidences are as follows. Firts, the monetary policy stance has been overal active, stabilizing inflation variability except for the early 2000 and the US financial crisis era around 2006. This implies that the model exhibits determinacy, i.e., a property of unique stable equilibrium in the mean-square stability, thereby leading to an active policy stance overal with periodic deviation to a passive regime.
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