S-Transform based fault detection algorithm for enhancing distance protection performance

This paper presents a new fault detection algorithm based on the Fast Discrete Stockwell Transform. The can improve functionality of existing distance protection and resolve shortcomings identified during process in case occurrence systems with high penetration power electronics-based generators. Reported results operation commercial relays four different vendors show that all experience difficulties ungrounded faults. An RTDS testbed is developed for extensive hardware loop testing, comprising electromagnetic transient models Type-3 Type-4 wind proposed successfully overcomes problems cases where maloperate. threshold parameters are set by using energy content attributed to Transform time–frequency domain signal. Other modules such as determination directionality, phase selection computation impedance, which necessary selectivity, currently available solutions applied relays. has been extensively tested various conditions obtained reported paper.