This paper presents a generic approach for developing and using Grid-based

2) Ecolc polytcclinique dc Montreal C.p. 6079, Succ. A Monubl (Qukbcc) H3C 3A7 CANADA (3) L'niwrsitC des scienccs et tcchniqucs de masuku Ecolc polytechnique de Masuku 4750. av. Henri-Julien Tel. :(5 14) 340 4542 Gabon ~ Montrhl (Qukbec) H2T 2C8 CANADA Fax. :(514) 340 3214 Tel. : (514) 289-8874 Fax. : (514) 289-171 I A b s t r a c tThis paper shows how to reduce the harmonic input ac currents and consequently to improve the power factor by controlling the switching frcqucncy of thc invcrter. An analytical procedure for power factor optimization is prcscntcd and thc opcration modcs of thc proposcd unity powcr factor parallcl resonant convcrter UPFPRC nrc dcscrihcd. Simplc analytical dcsign cquations arc dcrivcd and thc iiiflucncc or thc diffcrcnt circuit paramctcrs is in vcs t i gat cd .

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