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- A protection scheme for series active compensator is presented and analyzed in this paper. The proposed series active compensator operated as a high impedance K(Ω) to the fundamentals when short-circuit faults occur in the power distribution system, and two control strategies are proposed in this paper. The first is the method by detecting the fundamental source current through the p-q theory, the second is the method by detecting the fundamental component of load current in Synchronous Reference Frame(SRF). When the short-circuit faults occur in the power distribution system, the proposed scheme can protect the series active compensator without additional protection circuits. The validity of the proposed protection scheme was investigated through experimental results.