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김대균(D.G. Kim),정정훈(J.H. Chung),정춘병(C.B. Chung),김성남(S.N. Kim),이승환(S.H Lee),강승욱(S.W. Kang),오봉환(B.H. Oh),이훈구(H.G. Lee),김용주(Y.J. Kim),한경희(K.H. Han) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Since the residential load is an AC load and the output of solar cell is a DC power, the photovoltaic system needs the DC/AC converter to utilize solar cell. In case of driving to interact with utility line, in order to operate at unity power factor, converter must provide the sinusoidal wave current and voltage with same phase of utility line. Since output of solar cell is greatly fluctuated by insolation, it is necessary that the operation of solar cell output in the range of the vicinity of maximum power point. In this paper, DC/AC converter is three phase PWM converter with smoothing reactor. And then, feedforward control used to obtain a superior characteristic for current control and digital PLL circuit used to detect the phase of utility line.