When a distribution network consisting of Distributed Generations (DGs) is disconnected from upstream network, the system may be exposed to severe power imbalance. In order to prevent the damage of power plants, frequency relays operate and remove DGs from the network. In contrast to traditional methods, the main objective in new methods is to keep DG units in service in the islanded distributi...

when a distribution network consisting of distributed generations (dgs) is disconnected from upstream network, the system may be exposed to severe power imbalance. in order to prevent the damage of power plants, frequency relays operate and remove dgs from the network. in contrast to traditional methods, the main objective in new methods is to keep dg units in service in the islanded distributi...

In this paper, an interval approach is presented to achieve perfect selectivity and maximum sensitivity in distance relay zones, considering uncertainties. For this purpose, first, the uncertainties affecting the settings of the three zones of a distance relay are discussed. Then, by using the Monte-Carlo simulation, the uncertainties are modelled and the impedances seen by the distance relay a...

This paper introduces three coding strategies for using the Luby Transform (LT) code in a relay aided power-line communication scheme. In the first method, the relay decodes the received packets and re-encodes them for transmission towards the destination. In the second method, the relay only forwardes a random linear combination of its received packets towards the destination, while in the thi...

In this study, we introduce a new two-way relay channel and obtain an inner bound and an outer bound for the discrete and memoryless multiple access relay channels with receiver-source feedback via two-way relay channel in which end nodes exchange signals by a relay node. And we extend these results to the Gaussian case. By numerical computing, we show that our inner bound is the same with o...

Appropriate frequency response is an issue of great importance in power system management, especially islanded one. An energy-based method for assessing a system’s response, which needed to prevent under load shedding (UFLS), introduced. Renewable generation, such as wind turbine (WT) and photovoltaic (PV) facilities, reduces the ability resist imbalances increases risks consumer disconnections...

Abstract This paper presents a comprehensive under frequency load shedding (UFLS) model that can be implemented in multi‐area power system with real network characteristics. Conventional single‐area UFLS models operate on the basis of an equivalent center‐of‐inertia (COI) model, which ignores local dynamics response (SFR) and impacts location. Unlike single‐SFR is commonly utilized previous wor...

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...