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계통연계형 인버터의 왜곡된 계통전압에 의해 발생하는 전류고조파 저감방법
목형수(H.S. Mok),최규하(G.H. Choe),이정민(J. M. Lee),김상훈(S. H. Kim),지준근(J.K. Ji) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
Phase angle in grid-connected inverter is important information for current control. When different loads are connected to PCC(Point of Common Coupling) of grid, distorted grid voltage is taken place by load utility generating distorted current. Especially, in case the grid voltage is distorted by low order frequency such as 3<SUP>rd</SUP>, 5<SUP>th</SUP> harmonic, phase angle of PLL output is distorted. This paper analyze problem of current THD(Total Harmonic Distortion) due to distorted phase angle by distorted grid voltage, and propose control method compensating this problem. Also, it’s validity is verified by simulation and experiment.