This paper studies optimal power allocation to minimize symbol error rate (SER) of amplify-and-forward cooperative diversity networks. First, we analytically solve optimal power allocation problem to minimize SER for three different scenarios, namely, multi-branch single-relay, single-branch multi-relay and multi-branch multi-relay cooperative diversity networks, all subject to a given total re...

This paper presents voltage control scheme by using directly voltage-controlled distributedenergy resource units (VC-DERs) of an islanded microgrid to provide overcurrent,voltage sag and harmonics protection. The overcurrent protection scheme detects the fault, limits the output current magnitude of the DER unit, and restores the microgrid to its normal operatingconditions subsequent to fault c...

This work focuses on determining the switching limits in temperature for Reverse Conducting IGBTs and compares them to ‘‘conventional’’ IGBTs based on Trench technologies, all them belonging to 600 V–50 A application scenario. After, their leakage current under blocking state is tested at several working temperatures, in order to study the leakage current that limits the blocking safe operating...

Lately, adequate protection strategies need to be developed when Microgrids (MGs) are connected smart grids prevent undesirable tripping. Conventional relay settings adapted changes in Distributed Generator (DG) penetrations or grid reconfigurations, which is a complicated task that can solved efficiently using Artificial Intelligence (AI)-based protection. This paper compares and validates the...

the design and application of a fuzzy logic based controller to a leakage current relay waspresented in this paper. a novel approach based on fuzzy logic to form the tripping action of leakagecurrent relay was investigated. in addition to the theoretical aspect of fuzzy logic, detection of a leakagecurrent, measurement of the leakage current, determination of its duration, trip opening of fault...

The fault current levels through the electric devices have a significant impact on failure probability. New fault current results in exceeding the rated capacity of circuit breaker and switching equipments and changes operation characteristic of overcurrent relay. In order to solve these problems, SFCL (Superconducting Fault Current Limiter) has rising as one of new alternatives so as to improv...

The conventional protection schemes may lead towards the inadvertent operation of devices with increased penetration renewable energy sources based distributed generation (RES-DG) in distribution networks (DN). miscoordination and malfunctioning directional overcurrent relays (DOCR) occur due to significant change fault current level (FCL) network topology form radial ring caused by RES-DG. Opt...

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...

PT PAMA PERSADA is one of the power plants located in Kalimantan, Barunang which has 2 feeders. In feeders, protection coordination often occurs. These disturbances can hamper performance company PERSADA. This turned out to be a disturbance types overcurrent relays and ground fault relays. Where end it takes an evaluation analysis relay setting using Electrical Transient Analysis Program (ETAP)...

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...