Research Articles Power systems
A New Power Swing Detection Method Based on Hilbert Transform

Sirus Salehimehr; Behrooz Taheri; Seyed Amir Hosseini; Hossein Askarian Abyaneh; Farzad Razavi

Volume 3, Issue 2 , May 2020, Pages 103-114

https://doi.org/10.22111/ieco.2019.29378.1156

Abstract
  In this paper, a new method based on Hilbert transform is proposed to detect the power swing and faults occurring during the power swing. The proposed method operates independently from the system parameters. As well as, this method has the ability to detect different types of power swings, including ...  Read More

Research Articles Control
Maximum Power Point Tracking Using State-dependent Riccati equation based Model Reference Adaptive Control

Mostafa Rahideh; Abbas Ketabi; Abolfazl Halvaei Niasar

Volume 3, Issue 2 , May 2020, Pages 115-124

https://doi.org/10.22111/ieco.2019.28544.1133

Abstract
  In this paper, an adaptive control method is proposed for maximum power point tracking (MPPT) in photovoltaic (PV) systems. For improving the performance of an MPPT, this study develops a two-level adaptive control structure that can decrease difficulty in system control and efficiently handle the uncertainties ...  Read More

Research Articles Control
Numerical Method For Approximate Solutions of Fractional Differential Equations with Time Delay

fahimeh akhavan ghassabzadeh; Samaneh Soradi zeid

Volume 3, Issue 2 , May 2020, Pages 127-136

https://doi.org/10.22111/ieco.2019.30257.1184

Abstract
  Due to the easy adaption of radial basis functions (RBFs), a directRBF collocation method is considered to develop an approximate scheme to solvefractional delay differential equations (FDDEs). The method of RBFs is a method of scattered data interpolation that has many application in different fields. ...  Read More

Research Articles Optimization
Optimum Design of High-Temperature Superconducting Induction/Synchronous Motor to Increase Torque Density Using Collective Decision Optimization Algorithm

Milad Niaz Azari; Vasiye Lohrasbi; Seyed Abdolah Mousavi

Volume 3, Issue 2 , May 2020, Pages 137-145

https://doi.org/10.22111/ieco.2019.29084.1148

Abstract
  Today, with the high promotion of technology and the expansion of industries, electric motors are used extensively and consume a large part of the electrical energy produced by power plants. Therefore, researchers and experts have always sought solutions to make electric motors with high reliability ...  Read More

Research Articles Control
Frequency Response Improvement in Microgrids: A Fuzzy–based Virtual Synchronous Generator Approach

Amin Karimi; YousefReza Jafarian; Hassan Bevrani; Rahmatollah Mirzaei

Volume 3, Issue 2 , May 2020, Pages 147-158

https://doi.org/10.22111/ieco.2019.29879.1174

Abstract
  The use of renewable energy sources in microgrids has grown dramatically in recent years. The absence of a rotational mass in these microgrids and their interfaces leads to a lack of inertia and consequently, frequency and voltage instability. To cope with these dilemmas, the virtual synchronous generator ...  Read More

Research Articles Power systems
An Adaptive Control Method Based on Interval Fuzzy Sliding Mode for Direct Matrix Converters

Mehdi Bekrani; Mojtaba Heydari; Seyedeh Tahereh Behrooz

Volume 3, Issue 2 , May 2020, Pages 159-171

https://doi.org/10.22111/ieco.2019.30815.1191

Abstract
  In this paper, a new adaptive control method is proposed for direct matrix converters. The proposed method uses interval type-2 fuzzy logic integrated with sliding mode control. Employing the sliding mode control in matrix converters leads to an efficient choice of switching combinations and a reliable ...  Read More

Research Articles Optimization
Introducing a New Hybrid Adaptive Local Optimal Low Rank Approximation Method for Denoising Images

sadegh kalantari; mehdi ramezani; ali madadi

Volume 3, Issue 2 , May 2020, Pages 173-185

https://doi.org/10.22111/ieco.2019.31245.1199

Abstract
  This paper aimed to formulate image noise reduction as an optimization problem and denoise the target image using matrix low rank approximation. Considering the fact that the smaller pieces of an image are more similar (more dependent) in natural images; therefore, it is more logical to use low rank ...  Read More

Research Articles Optimization
Adaptive Repetitive Control for Periodic Disturbance Rejection with Unknown Period

Hassan Farokhi Moghadam; Nastaran Vasegh; Seyed Mohsen Seyed Moosavi

Volume 3, Issue 2 , May 2020, Pages 187-194

https://doi.org/10.22111/ieco.2019.31017.1197

Abstract
  In this paper, an adaptive repetitive controller (ARC) is proposed to reject periodic disturbance with an unknown period. First, a repetitive controller is designed when the disturbance period is known. In this case, the RC time delay is equal to the period of disturbance. Then, the closed-loop system ...  Read More

Research Articles Electronics
A new Mismatch cancelation for Quadrature Delta Sigma Modulator

alireza shamsi

Volume 3, Issue 2 , May 2020, Pages 196-204

https://doi.org/10.22111/ieco.2019.29632.1167

Abstract
  This paper proposes a new mismatch cancelation technique for quadrature delta-sigma modulators (QDSM). In this approach, a high speed and simple structure dynamic element matching (DEM) based on homogenization and time-division (HTD) is designed. In addition, I and Q digital-to-analog converters (DACs) ...  Read More

Research Articles Electronics
Numerical Investigation of External Electromagnetic Field Coupling to Coplanar Waveguide

Hamideh Dashti

Volume 3, Issue 2 , May 2020, Pages 205-211

https://doi.org/10.22111/ieco.2019.29597.1166

Abstract
  In this paper, for the first time, effects of external electromagnetic fields on a coplanar waveguide (CPW) are numerically studied by means of the method of finite elements. Two CPW lines with different geometry and dielectric substrate permittivity are considered. Both lines have characteristic impedance ...  Read More