摘要
Faults in a DC aircraft power system typically lead to serious equipment damage,which severely threatens the safety of the whole aircraft system.A fast and accurate real-time fault detection scheme is necessary for aircraft power systems to provide high reliability in the system.In this paper,a new fault detection device(FDD)is proposed based on the comb filter and second derivative of the system voltage to detect both low and highimpedance faults(HIFs)in a fast way.The proposed method utilizes the comb filter in the middle of the two first derivatives to detect both high and low-impedance faults within several microseconds.For demonstrating the efficiency,authenticity,and compatibility of the proposed method,digital time-domain simulations are carried out and verified by real-time simulations using an OPAL-RT simulator under different scenarios such as low-and high-impedance fault,overload,and motor starting to verify distinguishing between non-fault disturbances and faults.The results,which are compared with reported methods,prove the accuracy and speed of the proposed FDD in a DC aircraft.
