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This paper proposes the adaptive relaying of protective devices applied in the neighboring distribution feeders for reliable and efficient operations of a wind farm interconnected with distribution networks by dedicated lines. The wind farm connected with the electric power network is one of the great alternative energy sources; however, it would be also highly possible that the wind turbine generators are influenced by abnormal grid conditions such as disturbances occurring in the neighboring distribution feeders as well as the dedicated power. Particularly, in case of the fault happening in the neighboring distribution feeders, a wind farm might be accelerated until the fault is cleared by protective devices. Therefore, the delayed operation time of protective devices for satisfying the coordination might overly expose the interconnected wind turbine generators to the fault and cause damage to them. This paper describes the proper delayed operation time of protective relay satisfying the coordination of the distribution networks as well as reducing damage on the interconnected wind farm. The simulation results for Hoenggye substation model composed of five feeders and one dedicated line using PSCADEMTDC showed that the proper delayed time of protective devices reflecting the fault condition and the power output of the wind fa& could improve the operational reliability, efficiency, and stability of wind farm.

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