زهرا مروج
دانشگاه سمنان - دانشکده مهندسی برق و کامپیوتر
[ 1 ] - تمایز میان عیوب مکانیکی سیم‌پیچ، خطاهای الکتریکی داخلی و خارجی و جریان‌های هجومی در ترانسفورماتورها با استفاده از روش ترکیبی
در این مقاله، روش ترکیبی کارا جهت تمایز عیوب مکانیکی سیم‌پیچ از جریان‌های خطای گذرای ترانسفورماتورها و جریان هجومی پیشنهاد شده است. در این روش، از ابزار پردازش سیگنال و هوش مصنوعی به‌طور همزمان استفاده خواهد شد. ابتدا، عیب‌های مکانیکی سیم‌پیچ ترانسفورماتورها بر روی یک نمونه آزمایشگاهی (سیم‌پیچ ترانسفورماتور 1.6 مگاولت آمپری) بررسی می‌گردد. سپس، پارامترهای مدل مشروح سیم‌پیچ ترانسفورماتور در نرم...
[ 2 ] - Substation Expansion Planning Based on BFOA
In recent years, significant research efforts have been devoted to the optimal planning of power systems. Substation Expansion Planning (SEP) as a sub-system of power system planning consists of finding the most economical solution with the optimal location and size of future substations and/or feeders to meet the future demand. The large number of design variables, and combination of discrete ...
[ 3 ] - Artificial Intelligence Based Approach for Identification of Current Transformer Saturation from Faults in Power Transformers
Protection systems have vital role in network reliability in short circuit mode and proper operating for relays. Current transformer often in transient and saturation under short circuit mode causes mal-operation of relays which will have undesirable effects. Therefore, proper and quick identification of Current transformer saturation is so important. In this paper, an Artificial Neural Network...
[ 4 ] - Sub-transmission sub-station expansion planning based on bacterial foraging optimization algorithm
In recent years, significant research efforts have been devoted to the optimal planning of power systems. Substation Expansion Planning (SEP) as a sub-system of power system planning consists of finding the most economical solution with the optimal location and size of future substations and/or feeders to meet the future load demand. The large number of design variables and combination of discr...
[ 5 ] - Harmonics Estimation in Power Systems using a Fast Hybrid Algorithm
In this paper a novel hybrid algorithm for harmonics estimation in power systems is proposed. The estimation of the harmonic components is a nonlinear problem due to the nonlinearity of phase of sinusoids in distorted waveforms. Most researchers implemented nonlinear methods to extract the harmonic parameters. However, nonlinear methods for amplitude estimation increase time of convergence. Hen...
[ 6 ] - Optimal Placement of Phasor Measurement Units in Khorasan Network Using a Hybrid Intelligent Technique
In this paper, an efficient and comprehensive hybrid intelligent technique for the optimal placement of phasor measurement units (PMUs) is proposed to minimize the number of PMU installation subjected to full network observability. Three main purposes of PMUs output synchronous measurements are monitoring, control, and protection of power system. We have combined Binary Imperialistic Competitio...
[ 7 ] - تشخیص جریان هجومی از جریان خطای داخلی در ترانسفورماتورهای قدرت با روش تبدیل فوریه کسری
هدف این مقاله ارائه روش جدیدی درجهت بهبود حفاظت دیفرانسیل ترانسفورماتورهای قدرت است. تبدیل فوریه کسری روشی است که در این مقاله و درراستای تشخیص و تمایز جریان هجومی از جریان خطای داخلی استفاده شده‌است. تبدیل فوریه کسری یک روش زمان - فرکانسی است که برخلاف تبدیل فوریه معمولی قادر است، ویژگی‌های زمانی و فرکانسی یک سیگنال را به‌طور همزمان نشان دهد و بنابراین در شناخت ویژگی‌های سیگنال‌های ناایستا قد...
[ 8 ] - یک روش احتمالی جدید برای برنامه ریزی تولید نیروگاه های مجازی چند ناحیه ای
ریزشبکه‌ها، نمونهای عملی از مفهوم تولید غیرمتمرکز هستند. در این راستا، پس از تعیین فناوری‌های مناسب و ظرفیت اجزای تولید و ذخیره انرژی برای اهداف پدافندی، برنامه‌ریزی بهینه منابع در ریزشبکه‌ها دارای اهمیت ویژه‌ای است. ازاین‌رو، برنامه‌ریزی منابع تولید پراکنده و ذخیره‌سازهای انرژی در قالب نیروگاه مجازی باهدف افزایش بهرهوری این منابع مورد توجه اپراتورهای شبکه توزیع قرارگرفته است. این مقاله مدلی ...
[ 9 ] - Using a New Method to Incorporate the Load Uncertainty into the SEP Problem
In this paper, a new method is conducted for incorporating the forecasted load uncertainty into the Substation Expansion Planning (SEP) problem. This method is based on the fuzzy clustering, where the location and value of each forecasted load center is modeled by employing the probability density function according to the percentage of uncertainty. After discretization of these functions, the ...
[ 10 ] - Analysis of effective factors on transient ground potential rise in gas insulated substations
This study presents the manner in which transient modeling concepts, which are fully analyzed in the referred standards, are implemented, for the purpose of evaluating the Transient Ground Potential Rise (TGPR). This is a phenomenon of 10–100kV voltages with up to 10μs duration on the grounded enclosure of Gas Insulated Substations (GIS), which may cause concern for personnel safety and problem...
[ 11 ] - Detection of high impedance faults in distribution networks using Discrete Fourier Transform
In this paper, a new method for extracting dynamic properties for High Impedance Fault (HIF) detection using discrete Fourier transform (DFT) is proposed. Unlike conventional methods that use features extracted from data windows after fault to detect high impedance fault, in the proposed method, using the disturbance detection algorithm in the network, the normalized changes of the selected fea...
[ 12 ] - Fault location and classification in non-homogeneous transmission line utilizing breaker transients
In this paper, a single-ended fault location method is presented based on a circuit breaker operation using the frequencies of traveling waves. The proposed method receives the required data from voltage traveling waves with the aid of Fast Fourier Transform (FFT) and Wavelet Transform. Then, the Artificial Neural Network (ANN) identifies fault type and determines its location. In order to eval...
[ 13 ] - Fault Detection and Classification in Double-Circuit Transmission Line in Presence of TCSC Using Hybrid Intelligent Method
In this paper, an effective method for fault detection and classification in a double-circuit transmission line compensated with TCSC is proposed. The mutual coupling of parallel transmission lines and presence of TCSC affect the frequency content of the input signal of a distance relay and hence fault detection and fault classification face some challenges. One of the most effective methods fo...
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