An Improved Detection Algorithm of Sequence Current

In order to improve the protection reliability of asymmetric fault, real-time and accurate sequence current is very indispensable. This paper proposes a simple and effective method based on park transformation theory and conducts research on positive-current, negative-current and zero-sequence current. Moreover, the harmonic currents, active current and reactive current can be calculated. Through simulation experiment, the validity and feasibility of paper method have been confirmed.