Search results for: M. Zarghami
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This paper focuses on the application of BESS (Battery Energy Storage Systems) in improved operation of distribution grids that are highly penetrated with PV (Photovoltaic) systems. The paper features a state-space based model for BESS and implements a simple and effective approach for peak load shaving by considering device constraints. The grid-connected PV+BESS system proposed in this work contains...
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Increased penetration of Distributed Generation (DG) raises the total I2t levels on the power distribution network. Increased level of I2t is directly related to the stress levels impressed on the equipment during short circuit faults. In this paper, the definition and significance of I2t as it relates to increased stress level of equipment are explained. It is reconfirmed through simulations that...
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Increased penetration levels of Distributed Generation (DG) can cause steady state and transient voltage issues and possible overloading conditions. This paper aims to verify the overvoltage and overloading issues caused by DG at high penetration levels. A typical utility distribution feeder was selected using cluster analysis for simulations. DG at various penetration levels was interconnected at...
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The purpose of this paper is to formulate, document and present a novel optimal distribution substation bus design methodology considering reliability and economics. A simple test system is used to evaluate and compare four common distribution substation bus configurations. Capital, maintenance and operating costs including the costs of system losses as well as the expected customer outage costs have...
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California is striving to increase penetration of Distributed Generation (DG) to 33% by 2020. This effort is to promote energy independence of the state of California and to lead the country to be more environmentally conscious. However, integrating DG and increasing penetration to high levels will negatively impact the grid. One issue that has been discussed is that DG may supply more power than...
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Availability of data from Phasor Measurement Units (PMUs), characterized by their high accuracy to measure node voltage phasors, allows a simplification of the State Estimation (SE) problems. In this paper Iterated Kaiman Filter (IKF) algorithm, as a new method, has been used for SE of a test Active Distributed Network (ADN) integrating PMU measurements. In order to validate the results, Weighted...
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Interconnection of Photovoltaic (PV) systems as Distributed Generation (DG) sources to the distribution circuits are rapidly increasing due to their benefits and low maintenance. However, massive penetration of these systems will result in issues which can impact the operation, controls, and protection of the grids. One of these issues is related to extra injection of power during daytime with high...
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Distributed Generation (DG) level of penetration is expected to be increasing due to the state and federal governments mandates for utilization of renewable resources. The current Distribution Network (DN) was not originally designed for integration of DG at high penetration levels. Improvements will need to be made to DN to facilitate safe and reliable interconnection of DG at higher penetration...
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This paper discusses a simple method to perform peak load shaving through the means of energy storage systems owned by a utility. Peak load shaving, also referred to as load leveling or peak shifting, consists of the schemes used to eliminate the peaks and valleys in the load profile. This practice offers direct and indirect benefits to utilities in generation costs, line loss reduction, and volt...
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Interconnection of the Distributed Generation (DG) at higher penetration levels to the distribution grid is causing different problems with voltage profile of a typical distribution feeder. In this paper some of the voltage problems caused by increasing penetration of DG along with the role of the Volt-VAr controlling devices to mitigate these problems are investigated and discussed. A real distribution...
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This paper discusses applications and benefits of distributed storage devices on the performance of distribution power systems. In particular, the paper focuses the uses of Battery Energy Storage System (BESS) for system improvement. An overview of predominant battery types are covered in this paper along with their benefits and advantages. Diverse applications for BESS are described such as peak...
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European Psychiatry > 2013 > 28 > Supplement 1 > 1
Patient satisfaction is an important indicator of quality of care and health facilities. It is a predictor of patient willingness to follow treatment regimen.Patient perception of nurse caring has been associated with positive patient outcomes, better postoperative functional status and less symptom distressTo determine efficacy of transactional analysis training on inpatient‘s satisfaction of nurses...
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Materials and Design > 2010 > 31 > 7 > 3518-3524
In the present study, the effect of Fe-rich intermetallics has been investigated on the wear behavior of eutectic Al–Si alloy (LM13). Dry sliding wear tests have been conducted using a pin-on-disk machine under different normal loads of 18, 51, 74 and 100N at a constant sliding speed of 0.3m/s. Addition of 1.2% Fe to the LM13 alloy leads to the formation of the flake like β-intermetallic compounds...
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This paper discusses a novel approach for damping inter-area oscillations in a bulk power network using multiple unified power flow controllers (UPFC) utilizing ultracapacitors, also known more generally as electrochemical capacitors (EC). In this paper, a new control is introduced to mitigate inter-area oscillations by directly controlling the UPFCs' sending and receiving bus voltages which better...
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The increased penetration of phasor measurements units (PMUs) in electric power grids have put to forefront issues related to quality of phasor data. Phasor measurements, because of their perceived inherent accuracies, are oftentimes used to benchmark the results of critical system monitoring functions such as state estimators. However, instrument transformers significantly impact the final accuracies...
