Sharif University of TechnologyScientia Iranica1026-3098311720241101Comprehensive stochastic analysis method for tree-type PDNs and ground pollution on mixed-signal PCBs146314782328110.24200/sci.2023.57864.5448ENMiladMehriDepartment of Electrical Engineering, Faculty of Engineering, Alzahra University, Tehran, IranJournal Article20210308In this paper, a stochastic analysis method is proposed for extraction and evaluation of power distribution map (PDM) in system printed circuit board (PCB). This is conducted based on some system-level information including placement and routing geometry, power distribution network (PDN), component package parasitic, and voltage regulator module (VRM). A simple model for supply current of two constituent blocks of electronic systems is analytically extracted. The worst-case simultaneous operation of all consumers are considered for PDM extraction. The approach is applied to a specific designed and fabricated mixed signal board. PDM is beneficial in the placement process of decoupling capacitance or noisy components in an optimum and right location. Also, the proposed approach can be considered as a verification step of PCB design flow and be applicable before routing merely based on the placement data of the system components. This enables the designer to predict the upcoming problems in layout and hastens the process of design verification.https://scientiairanica.sharif.edu/article_23281_6fb6f518080f375a066141f1ee732dba.pdfSharif University of TechnologyScientia Iranica1026-3098311720241101A simplified approach to calculate the earth fault current division factor passing through the substation grounding system147914892283310.24200/sci.2022.57886.5458ENHossienSaeedniaUniversity of Science and Technology of Mazandaran, P.O.Box 48518-78195, Behshahr, IranNabiollahRamezaniUniversity of Science and Technology of Mazandaran, P.O.Box 48518-78195, Behshahr, IranJournal Article20210327The main aim of designing a safe grounding system is to provide a low impedance path to the flow of the earth fault currents without exceeding the operational constraints and equipment limits that will ensure electrical continuity. One of the most significant and well-known parameters to design a safe grounding system in power systems is the exact determination of the maximum earth fault current division factor. This paper presents a simplified and accurate method to calculate the earth fault current division factor in different states of the earth fault occurrence within and the vicinity of the substation under study. In the proposed method, a hybrid overhead-cable line, the impact of the frozen soil, mutual coupling between phase conductors and guard wires, grounding system resistance of adjacent substations, different tower footing resistances, the impact of the phase conductor impedance, and different spans in transmission lines can be considered. In addition, a closed-form formulation is also developed for the occurrence of the earth fault on the transmission line. Finally, details of the analysis results of this study have been compared with other methods in the literature. The validity and accuracy of the proposed approach also have been assayed and confirmed in details.https://scientiairanica.sharif.edu/article_22833_8de8488a4b6b6d6303df105b9a1f37b0.pdfSharif University of TechnologyScientia Iranica1026-3098311720241101Forecasting intrusion in critical power systems infrastructure using Advanced Autoregressive Moving Average (AARMA) based intrusion detection for efficacious alert system149015032308010.24200/sci.2023.58059.5550ENNeeraj KumarSinghDepartment of Electrical Engineering Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India-395007MahshooqAbdul MajeedDepartment of Electrical Engineering Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India-395007VasundharaMahajanDepartment of Electrical Engineering Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India-395007Journal Article20210409Cyber intrusions into critical infrastructure inflict economic and physical damage. Extensive research is needed to identify and mitigate intrusions in power grid infrastructure. The modern solution is to use a data science time-series approach to identify the intrusion based on the electric grid data collected from the sensors. This paper addresses the new vision of the data science time-series modelling approach to integrate it with the existing power system security system. In this paper, the Advanced Autoregressive Moving Average (AARMA) model is designed to detect the possible intrusion of the given data set. An attack forecast is a model to predict possible cyber intrusions using real-time data input from sensors. By investigating the statistical properties of the sensors’ data set, intrusion detection is possible with a high accuracy of about 90%. Using AARMA, the operators have the benefit of an effective alert system to adjust their configuration and other resource allocation to tackle intrusions with low impact. MATLAB software is used to monitor the IEEE 9-bus and IEEE 33-bus test system against possible cyber-attacks using the proposed AARMA model.https://scientiairanica.sharif.edu/article_23080_1483db46e28fab8ae9733142339fc2af.pdfSharif University of TechnologyScientia Iranica1026-3098311720241101A joint encryption-encoding scheme using QC-LDPC codes based on finite geometry150415162286410.24200/sci.2022.58300.5658ENHosseinKhayamiInformation Systems and Security Laboratory, Department of Electrical Engineering, Sharif University of Technology, Tehran
11155-11365, IranTaranehEghlidosElectronics Research Institute, Sharif University of Technology, Tehran 11155-11365, IranMohammad RezaArefInformation Systems and Security Laboratory, Department of Electrical Engineering, Sharif University of Technology, Tehran
11155-11365, IranJournal Article20210511Joint encryption encoding schemes have been released to fulfill both reliability and security desires in a single step. Using Low Density Parity-Check (LDPC) codes in joint encryption encoding schemes, as an alternative to classical linear codes, would shorten the key size as well as improving error correction capability. In this article, a joint encryption encoding scheme using Quasi-Cyclic Low Density Parity-Check (QC-LDPC) codes based on finite geometry is presented. It is observed that our proposed scheme not only outperforms its predecessors in key size and transmission rate, but also remains secure against all known cryptanalyses of code-based secret key cryptosystems. In this paper, we have proposed an idea to make QC-LDPC based cryptosystems secure against reaction attacks. It is subsequently shown that our scheme benefits from low computational complexity. By taking the advantage of QC-LDPC codes based on finite geometry, the key size of our scheme is very close to its target security level. In addition, using the proposed scheme, a wide range of desirable transmission rates are achievable. This variety of codes makes our cryptosystem suitable for a number of different communication and cryptographic standards such as wireless personal area networks (WPAN) and digital video broadcasting (DVB).https://scientiairanica.sharif.edu/article_22864_02a3d958618f9af62a74a70c8c392393.pdfSharif University of TechnologyScientia Iranica1026-3098311720241101State estimation in unbalanced distribution networks by symmetrical components151715292286610.24200/sci.2022.58775.5890ENAminDadashzadeDepartment of Electrical and Computer Engineering, University of Tehran, Tehran, P.O. Box 14395-515, IranShahabBahramiDepartment of Electrical and Computer Engineering, University of British Columbia, Vancouver, P.O. Box: V6T 1Z4, CanadaFarrokhAminifar- Department of Electrical and Computer Engineering, University of Tehran, Tehran, P.O. Box 14395-515, Iran
- Department of Electrical and Computer Engineering Illinois Institute of Technology, Chicago, IL, P.O. Box 60616-3793, USAJournal Article20210727State estimation (SE) of a power distribution network plays a vital role in the distribution management systems (DMSs). SE results can monitor and counteract grid technical challenges like tracking the unbalanced operation condition. In this paper, we propose a new approach for unbalanced distribution system SE which is based on the decomposition of the original problem into three subproblems by applying the symmetrical components. The subproblems are of lower dimensions and solved in parallel leading to much less computation time. The convex relaxation method is applied to address nonconvex ac power flow equations and formulate the distribution network SE problem as a semidefinite program (SDP). Furthermore, an algorithm is proposed to detect and attenuate bad data in measurements along with the SE solution. The proposed unbalanced distribution system SE approach is applied to the IEEE 37- and 123-bus distribution test systems with µPMU and pseudo measurement. The results are compared with those of three-phase SDP-based and linearized SE methods. The superiority of proposed approach is verified in terms of computation time and accuracy.https://scientiairanica.sharif.edu/article_22866_53c515189ab697f75707c5ea540ddd04.pdfSharif University of TechnologyScientia Iranica1026-3098311720241101A cost-efficient based cooperative model for reliable energy management of networked micro grids within a smart island153015462303010.24200/sci.2022.58851.5928ENMohammad YasinDivaniDepartment of Electrical Engineering, Bushehr Branch, Islamic Azad University, Bushehr, IranMojtabaNajafiDepartment of Electrical Engineering, Bushehr Branch, Islamic Azad University, Bushehr, IranAmirGhaediDepartment of Electrical Engineering, Dariun Branch, Islamic Azad University, Dariun, IranHamedGorginpourDepartment of Intelligent Systems Engineering and Data Science, Persian Gulf University, Bushehr, IranJournal Article20210811This paper mainly focuses on investigating a stochastic energy management approach to enhance reliability of the networked microgrids within a smart island. In this regard, a networked microgrid is considered in the smart island, which is integrated with a multi-energy hub (multi-EH) system aiming to simultaneously support the electrical, thermal, and water demands of the island, isolated from the main grid. The objective function is organized as the cost of operation and reliability of the networked microgrid and is solved using a modified bat algorithm. The uncertainty of stochastic parameters is modelled using the 2-m point estimate method, which has notable advantages in terms of accuracy and simplicity of implementation. Different scenarios are considered both in critical and normal conditions to evaluate the performance of the studied model. Both GAMS and MATLAB software’s were employed to study the proposed model. The proposed model improved the reliability of the networked microgrid system and results reveal that the proposed cooperative approach could decrease total operation and investment cost of the networked microgrid by 13%.https://scientiairanica.sharif.edu/article_23030_dc808ee655de4fc5083f31e763406697.pdfSharif University of TechnologyScientia Iranica1026-3098311720241101Half hexagonal shaped UWB antenna with triple band notch using resonating structures for wireless communication154715552321610.24200/sci.2023.59268.6145ENUshabenKeshwalaDepartment of Computer Science and Engineering, Amity University Uttar Pradesh, Noida, IndiaSanyogRawatManipal University Jaipur, Jaipur-Ajmer Express Highway, Dehmi Kalan, Near GVK Toll Plaza, Jaipur, Rajasthan, IndiaKanadRayAmity University Rajasthan, SP-1, Kant Kalwar, NH-11C, RIICO Industrial Area, Jaipur, Rajasthan, IndiaJournal Article20211017In this article, an UWB (Ultra-wide Band) compact monopole antenna with triple band-notched characteristics is presented. The proposed structure is designed on the FR-4 substrate with εr=4.3, tan δ = 0.025. The antenna structure consists of half-hexagon monopole with rectangular and square resonant spirals structures for the exclusion of frequency bands for WiMAX (3.25-3.85GHz), WLAN(5.15-5.85GHz) and Fixed/Mobile Satellite Communication (7.55-7.75GHz). The compact antenna of size 28x 29 mm2 achieves simulated ultra-wide bandwidth of 14.7GHz (2.9GHz-17.6GHz) and measured bandwidth of 14.8GHz (3.21-18.0GHz). The stable gain characteristic is obtained for pass band and gain is reduced to -2.02dBi (3.57GHz), 0.4 dBi (5.3GHz) and-2.75dBi (7.6GHz) at band notch frequencies.https://scientiairanica.sharif.edu/article_23216_a967ee42a02e78593a5cbef96fe38393.pdfSharif University of TechnologyScientia Iranica1026-3098311720241101Compact Y -shaped antenna with partial and meandered ground for WLAN/Wi-MAX applications155615662296610.24200/sci.2022.59299.6163ENAchyutSharmaE.M. Analysis Lab, Department of Physics and Material Science, Jaypee University of Information Technology, Waknaghat,
Distt. Solan, Himachal Pradesh, India, 173234Sunil KumarKhahE.M. Analysis Lab, Department of Physics and Material Science, Jaypee University of Information Technology, Waknaghat,
Distt. Solan, Himachal Pradesh, India, 173234SanyogRawatDepartment of Electronics and Communication Engineering, Manipal University Jaipur, Rajasthan, India, 303007Journal Article20211026A broadband compact Y shaped monopole antenna with band-notched characteristics is designed and investigated. The antenna structure is based on the defected ground with slit resonating structures. The ground plane is loaded with two hook shaped slots on the opposite edges along its width. One horizontal slot and one vertical slot are also etched on the ground plane to improve the impedance matching for the design to resonate in WiMAX and WLAN wide bands. It operates at the frequencies of 2.68 GHz, 3.75 GHz and 5.72GHz for WLAN and Wi-MAX applications. The compact antenna has a size of 30×30×1.59 mm3 and stable radiation patterns are obtained at resonant frequencies.https://scientiairanica.sharif.edu/article_22966_a8153e5ac3924df1353973ad80f5cc45.pdf