The stability problem of weak grid connected converter interfaced generation (CIG) cannot be ignored. For multiple weak grid connected CIGs with different parameters. the system oscillation characteristics and equivalence methods still need to be further studied. This paper first discusses the oscillation characteristics when CIGs are perfectly coupled. https://www.bekindtopets.com/limited-value-SharkBite-U648LF-Lead-Free-Brass-Push-to-Connect-45-Degree-Elbow-1-2-x-1-2-mega-super/