This paper aims at analysing the potential impacts that distributed generation might have on stability of electrical power networks. In particular, performance a system with significant penetration resources is described to assess different types bulk network. For this purpose, hypothetical network simulated, assuming large number fuel cells and micro-turbines as dispersed units in low-voltage area. The investigation carried out constant load demands but contributions from micro-turbines....

Recently, the study of transformer oil-based nanofluids became great interest, due to their prospective properties as a dielectric and cooling medium. However, agglomeration nanoparticles limits beneficial that can be obtained from nanofluids. So, work presented in this paper aims get enhanced dispersion behavior within Then, breakdown strength with is evaluated. In order behavior, were prepared using surfactant. The surfactant plays role stabilization maintaining suspension stability....

With increased penetration of wind energy as a renewable source, there is need to keep turbines connected the grid during different disturbances such faults. In this paper, use superconducting fault current limiter (SFCL) proposed reduce level at stator side and improve ride-through (FRT) capability system. To highlight technique, doubly fed induction generator (DFIG) considered wind-turbine generator, where whole system simulated using PSCAD/EMTDC software. Detailed simulation results are...

This paper presents a new symmetrical single-phase nine-level dc-ac converter for the applications of distributed generation systems. The proposed multilevel inverter (MLI) utilizes four independent dc sources to generate nine output voltage levels considering reduced number switching devices. consists main and auxiliary circuits. circuit is single H-bridge circuit, which responsible polarity. special combination devices, are used synthesize voltage. merits MLI are: increased at low loss,...

Placenta accreta spectrum (PAS) disorders have become a significant life-threatening issue due to its increased incidence, morbidity and mortality. Several studies tried identify the risk factors for PAS disorders. The ideal management is matter of debate. study objectives were evaluate incidence compare different strategies at tertiary referral hospital, Minia, Egypt.This prospective included 102 women diagnosed with admitted Minia Maternity university Egypt between January 2017 August...

To guarantee efficient and stable operation of a microgrid, overcharging unbalanced state charge (SOC) batteries have to be mitigated. An adaptive droop control scheme is proposed in this study provide energy management between distributed having SOC different capacities. The approach suggests using factor proportional the n th order charging mode inversely discharging mode. Moreover, modification adapt performance taking into account battery relative capacity. capacity an individual defined...

A novel two-phase approach to manage the daily operation of proton exchange membrane (PEM) fuel cells for residential applications is presented in this paper. Conventionally, performance optimization carried out offline since it a time-consuming process and needs high computational capabilities. To simplify management enable online parameter updating, paper suggests new technique using artificial neural networks (ANNs). First, database extracted by performing processes at different load...

In this paper, a study on the dielectric properties of transformer oil-based nanofluids is presented. Titanium oxide nano ceramic particles, known as titania nanofillers, was used in investigation process. The nanofluid samples were prepared using two-step method, which, nanoparticles mixed with base oil and then dispersed magnetic stirrer, dispersants ultrasonic processor. Different amounts considered best amount dispersant determined according to observed images obtained by an optical...

This study presents an adaptive differential evolution (DE) algorithm to allocate the thyristor-controlled series compensator (TCSC) incorporated with reactive power management problem. In addition, a dynamic updating is applied for scaling and penalty factors enhance performance of multi-objective DE algorithm. During selection best candidate lines efficient allocation TCSC devices, three situations are considered excluded transmission lines. These connected between two generating units;...

To ensure the full benefits from wind generation systems, an effective maximum power point tracking (MPPT) technique should be implemented. In this article, adaptive fuzzy logic controller (AFLC) is presented as a control methodology for producing peak permanent magnet synchronous generator (PMSG)-based turbine (WT). Regardless of importance and significance modeling simulation processes, experimental studies occupy most important aspect remain big challenge. The first part article devoted...

An approach to identify generic dynamic equivalents distribution systems using recurrent artificial neural networks (ANN)s is presented. It expected that in the near future a large number of active sources will be utilised within and thus, neither detailed modelling nor lumped-load representation for areas acceptable. Therefore, paper suggested training ANN represent behaviour network is. To involve characteristics ANN, values features are involved also introduced at input layer, thereby...

This paper presents a dynamic mathematical model for Polymer Electrolyte Membrane "PEM" fuel cell systems to be used electric vehicle applications. The performance of the cell, depending on developed and taking double layer charging effect into account, is investigated with different process parameters evaluate their unit behavior. Thus, it will easy develop suitable controllers regulate operation, which encourages use cells especially vehicles steady-state verified using comparison...

After several operating years of power transformers, the oil is aged resulting in deterioration properties. This attributed to effect aging byproducts represented by acidity and moisture content. From this view point, study aims mitigate impact enhance properties with aid nanofillers be reused transformer. To simulate actual period transformer, accelerated test carried out laboratory. mainly depends on heating an oven at 120 °C for different number days. Through these conditions, one day...

The high accuracy of fault location in transmission lines reduces outage time and increases system reliability. Most the needed for fixing is consumed determining fault. Many methods are usable single-fault events. This paper presents an advanced algorithm to detect, discriminate, locate single simultaneous shunt faults. A combination single- double-end techniques travelling wave signature used accurately determine location. Comprehensive simulation results investigated make sure that...

The electric utility industry is moving towards a deregulated and competitive market to meet customer expectations. So, system performance reliability assessments are getting targeted more than before. Several measures of developed in the literature. In this research, NEPLAN Simulator analysis module used determine all indices different cases study considering effect Advanced Distributed Automation System (ADAS). also benefits from presence Penetration Generation (DG) units Soft Open Points...

This paper presents a modified shifted-level pulse width modulation (PWM) for an 11-level multilevel inverter (MLI) that used distributed generation systems and medium high power energy conversion applications because of the flexibility in voltage level this converter has been introduced. employs five independent DC sources to generate eleven output levels considering reduced number switching devices. The proposed control arrange devices synthesize voltage. MMLI structure consisted...

This paper introduces a recurrent ANN-based dynamic equivalent for distribution networks in interconnected power systems and outlines the implementation of such equivalents simulation packages. According to this approach, ANN is trained offline mode using measurements only at boundary buses hence it independent network size complexity. Then, suitable model, which depends on structure parameters ANN, developed implemented within program. As proposed interacts with retained subsystem online...

Towards the complete vision of smart distribution grid, this paper presents a generic framework and strategy for implementation automation system (DAS). Fault location, isolation service restoration (FLISR) is one most beneficial desirable applications DAS self-healing reliability improvement networks. FLISR implemented on an actual, urban, underground medium voltage (MV) network based substation-centralized scheme, called SC-FLISR. The structure procedure SC-FLISR are introduced. fully...

The virtual power plant (VPP) has the ability to control and manage electrical energy flow between aggregated units obtain better operation of system. This is aiming minimize cost produced therefore enhance economical operation. To satisfy that, in planning stage, it important select optimal number VPP buses, location distributed generations value dispatchable load. In this paper, a novel methodology introduced identify border (location buses), within VPP. addition identifying Uncertainties...

When mineral oil is exposed to aging processes during their operation, properties significantly deteriorate. This necessitates reclamation of the or replacement with a new one. Both solutions are not preferred due high cost. From this viewpoint, study aims enhance aged by using nanofillers be suitable for reusing in power transformers. Accelerated test carried out through heating at 120 °C an oven different periods days. Under condition, accelerated one day considered equivalent year field....