In many applications the flow that past bluff bodies has frequency nature (oscillated) and it is not uniform. This kind of flow has effects on the formation of vortex shedding behind bluff bodies. In this paper the flow around a circular cylinder was numerically simulated. The effects of frequency variation at inlet flow on the vortex shedding frequency were investigated. The transient Two-Dime...

Doubly-fed induction generator (DFIG) based wind turbines with traditional maximum power point tracking (MPPT) control provide no inertia response under system frequency events. Recently, the DFIG wind turbines have been equipped with virtual inertia controller (VIC) for supporting power system frequency stability. However, the conventional VICs with fixed gain have negative effects on inter-ar...

The Under-Frequency Load Shedding (UFLS) scheme is an emergency measure in place to prevent system collapse the event of a large generation deficit relative demand at any moment time. However, effectiveness traditional UFLS schemes may be compromised as network power flows change due growth distributed (DG) and reduction inertia. This study has shown some issues affecting protection with rising...

Represented by wind turbines and ultra high-voltage DC (UHVDC), the power-electronic interfaced power sources participate in fast frequency control, which has a significant impact on system frequency. However, conventional under-frequency load shedding (UFLS) scheme doesn’t take into account above, resulting unreasonable after large loss of generation. To this end, article proposes an adaptive ...

Due to the limited generation, finite inertia, and distributed structure, microgrid suffers from large frequency and voltage deviation which can lead to system collapse. Thus, reliable load shedding method to keep frequency stable is required. Wireless network, benefiting from high flexibility and low deployment cost, is considered as the promising technology for microgrid management. In this p...