You Do Need power plug adapter while traveling from Papua New Guinea to Dominican Republic.

Here is Why You Need An Adapter

The outlet and plug type used in Dominican Republic are A, B and C and in Papua New Guinea is I. This is how they look like.

Papua New Guinea

In Papua New Guinea, outlets of type I are in use.

Type I

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C