A Unit Protection Scheme Based on Transient Signals for Active Distribution Network

摘要

This paper proposes a unit protection scheme based on transient signals for active distribution network (ADN). First, the fault transient characteristics of ADN is analyzed. Then, the faulted phase selection method based on transient voltage, and fault direction identification criterion based on impedance of frequency domain are proposed. Furthermore, based on the fault direction identification results, the identification criteria for faulted feeder, busbar and branch line are proposed. Finally, extensive simulations are performed in ADN model. Simulation results verify the validity of the proposed protection scheme.