Agent-based protection scheme for distribution networks with distributed generators

Effect of DG on Distribution Grid Protection

“…Recent developments in protective systems are focused on adaptive protection schemes which can distinguish grid disturbances in distribution grids including DG. The papers written on these developments are numerous and some interesting and promising results are reported in (Brahma & Girgis, 2004;Perera & Rajapakse, 2006;Perera et al, October 2008). Traditional protective systems make use of locally measured quantities and react if one of these quantities is violating a certain threshold while new adaptive protective systems rely on information obtained by specific measurement systems.…”

“…A drawback of this system is its heavy dependence on a centralized processing system and the communication links between the zones. In (Perera & Rajapakse, 2006;Perera et al, October 2008) an agent-based protective system is discussed which overcomes the drawback of the previous system. This protective system also splits up the distribution grid into zones and exchanges data for these zones via communication links.…”

Fast isolation of faults in transmission systems using current transients

“…In addition, as pointed out in [7], the wavelet coefficient corresponding to the faulted branch has higher magnitude. A more detailed description of the fault direction identification procedure can be found in [11].…”

“…The reflections coming from the terminal ends are insignificant for ungrounded fault. For example, for fault F1, t 11 and t 12 are the arrival times of the transient originating from the fault and its first reflection from the fault, respectively. The time delay (t d = t 12 − t 11 ) can be estimated by using the WTCs of the currents signals.…”

Research on the Protection Scheme of DG Interconnection Transition Mode Based on Decoupling Zero Sequence

“…It is predicted that many disperse units will interconnect with smaller industrial and commercial facilities and power grids so as to reduce energy consumption of local load by the means of share or "peak shaving". Distributed generation DG needs the protection not only in the case of short circuit, but also in abnormal operating conditions [1,2,3] . Many abnormal conditions are applied to DG by the system.…”