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The generated power of wind turbine generators changes with wind speed. The higher the ratio of wind generation to all system generation is, the more wind turbine generators influence the power system due to variable characteristics of wind. In particular, independent power systems with small capacities, such as remote islands, will be greatly influenced. This paper adopts real system data of a remote island of Taiwan to investigate impacts on power systems under light load condition that are interconnected with wound rotor induction generators or doubly-fed induction generators in different power factor control modes and voltage control mode when wind speed ramps down. The results are very helpful for both system planning and operations.