Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2009.2045.2055YounisMahmoud A.A.RahimNasrudin Abd.MekhilefS.112009911This study presents the analysis and design of distributed
generation system. The system consists of a full-bridge DC-DC converter,
two units of three-phase inverters connected in parallel and a controller.
Two units of conventional three-phase DC-AC inverters connected in parallel
with series resistors were added to the inverter output to maintain the
same current in each inverter and to minimize the circulating current
in the parallel inverters. High frequency third harmonic injection PWM
(THIPWM) was employed to reduce the total harmonic distortion and to make
maximum use of the DC bus voltage. The generation of control algorithm
for three-phase inverter is implemented in Digital Signal Processing (DSP)
boards. The THIPWM have been done such that the inverter output voltage
is synchronized with the grid voltage thus making the inverter suitable
for grid connection. The three-phase inverter operates with a total harmonic
distortion of less than 2% on output voltage and current signals. Experimental
results are shown validate the proposed system. A full distributed generation
system has been implemented and tested, the testing of the system proves
that the system operates with minimum circulating current on the parallel
connected inverter and minimum harmonic distortion on the inverter output
voltage and current.]]>Ead, S.A., N. Rajaratnam, C. Katopodis and F. Ade,2000Hughes, W.C. and J.E. Flack,1984Khan, A.A. and P.M. Steffler,1996Liu, M., N. Rajaratnam and D.Z. Zhu,2004Ali, H.S.M.,1991Negm, A.M.,2002Tokyay, N.D.,2005Vischer, D.L. and W.H. Hager,1995Wu, S. and N. Rajaratnam, 1995Zhang, B., A.Q. Huang and B. Chen,2005Daly, P.A. and J. Morrison,2001Puttgen, H.B., P.R. MacGregor and F.C. Lambert,2003Hammons, T.J.,2007Cai, H., R. Zhao and H. Yang,2008Cho, J.G., J.A. Sabate, G. Hua and F.C. Lee,1996Kwasinski, A., P.T. Krein and P.L. Chapman,2003Lee, C.S., S. Kim, C.B. Kim, S.C. Hong and J.S. Yoo et al.,1998Marei, M.I., E.F. El-Saadany and M.M.A. Salama,2004Ogasawara, S., J. Takagaki, H. Akagi and A. Nabae,1992Rashid, M.H.,2004Kwak, M.S. and S.K. Sul,2006Marwali, M.N. and A. Keyhani,2004Naik, R., N. Mohan, M. Rogers and A. Bulawka,1995Nigim, K.A. and Y.G. Hegazy,2003Nigim, K.A. and W.J. Lee,2007Grijalva, S. and A.M. Visnesky,2005Texas Instruments,2004Wang, F., S. Rosado, T. Thacker and D. Boroyevich,2004Ma, X., W. Wang, Y. Kang and J. Chen,2005Vazquez, N., H. Rodriguez, C. Hernandez, E. Rodriguez and J. Arau,2008Ead, S.A. and N. Rajaratnam,2002