Research Articles Control
Robust Sliding Mode-based UPQC for Transient Conditions in Weak/ Islanded Networks

Omid Moradi; Saeed Abazari; Nima Mahdian

Volume 4, Issue 3 , August 2021, Pages 267-276

https://doi.org/10.22111/ieco.2020.35963.1308

Abstract
  This paper proposes a nonlinear model by an optimal stabilizing controller for weak/islanded grids using a unified power quality conditioner (UPQC). The UPQC can be employed to stabilize a grid-tie inverter (GTI) or a synchronous generator (SG) with minimum control effort. The idea that GTI behavior ...  Read More

Research Articles Power systems
Discrimination among Winding Mechanical Defects in Transformer Using Noise Detection and Data Mining Boosting Method

Zahra Moravej; Seyed Mahmood Mortazavi; Mojtaba Mohseni

Volume 4, Issue 3 , August 2021, Pages 277-284

https://doi.org/10.22111/ieco.2021.36793.1327

Abstract
  IIn this paper, an efficient method to detect and discriminate mechanical defects of transformer winding based on extracting the winding frequency responses using outlier data detection and ensemble algorithms ,which in total constitutes an efficient hybrid method has been proposed. First, the frequency ...  Read More

Research Articles Power systems
A New DC Fault Detector Scheme for Multi-terminal HVDC Transmission lines

Mohammadreza Noori; Seyed Ghodratollah Seifossadat; Alireza Safarian

Volume 4, Issue 3 , August 2021, Pages 285-297

https://doi.org/10.22111/ieco.2021.36403.1317

Abstract
  In this paper, a novel selective DC fault detector approach based on the adaptive cumulative sum method (ACUSUM) is suggested for the protection of high voltage direct current (HVDC) transmission lines. Using a communication channel, the proposed method detects DC fault occurrence as well as determining ...  Read More

Research Articles Optimization
Hybrid Functions to Solve Fractional Optimal Control Problems Using the Collocation Method

Seyed Mehdi Shafiof; Javad Askari Marnani; Maryam Shamssolary

Volume 4, Issue 3 , August 2021, Pages 299-311

https://doi.org/10.22111/ieco.2021.37207.1334

Abstract
  This article aims to introduce a modern numerical method based on the hybrid functions, consisting of the Bernoulli polynomials and Block-Pulse functions. An indirect approach is proposed for solving the fractional optimal control problems (FOCPs). Firstly, the two-point boundary value problem (TPBVP) ...  Read More

Research Articles Communication
Methods and Criteria for Evaluating Controllability of Video Bit Rate in HEVC-SCC

Hadi Esmaeeli; Mehdi Rezaei

Volume 4, Issue 3 , August 2021, Pages 313-320

https://doi.org/10.22111/ieco.2021.37880.1344

Abstract
  Videos directly captured from a computer or smartphone screen have certain characteristics that differentiate them from camera-captured (CC) ones. These videos are called screen content (SC) videos whose specific encoder has been introduced as a new extension of the HEVC standard called screen content ...  Read More

Research Articles Optimization
Reconfiguring Distribution Networks by Means of Minimizing Power Loss and Considering Overcurrent Protection

Elham Khoshbakht Sangcar; Farhad Namdari; Mysam Doostizadeh

Volume 4, Issue 3 , August 2021, Pages 321-331

https://doi.org/10.22111/ieco.2021.36302.1316

Abstract
  This paper studies the reciprocal impact of distribution network protection and reconfiguration of active Nowadays, with increasing energy consumption in distribution networks and the demand of consumers to buy highly reliable power, it is of high importance to establish adapt between protection and ...  Read More

Research Articles Control
A Discussion on the Existence of Smooth Lyapunov Functions for Continuous Stable Systems

Majid Akbarian; Naser Pariz

Volume 4, Issue 3 , August 2021, Pages 333-340

https://doi.org/10.22111/ieco.2021.35409.1300

Abstract
  Lyapunov's theorem is the basic criteria to establish the stability properties of the nonlinear dynamical systems. In this method, it is a necessity to find the positive definite functions with negative definite or negative semi-definite derivative. These functions that named Lyapunov functions, form ...  Read More

Research Articles Power systems
Dynamic Stability Improvement of Power System with Simultaneous and Coordinated Control of DFIG and UPFC using LMI

Masoud Maleki Rizi; Saeed Abazari; Nima Mahdian

Volume 4, Issue 3 , August 2021, Pages 341-353

https://doi.org/10.22111/ieco.2021.37604.1340

Abstract
  This paper presents enhancement of power system dynamic stability while equipped with both unified power flow controller and doubly fed induction generator by using LMI technique. We have used all UPFC (Unified Power Flow Controller) main basic PI controllers and its POD (Power Oscillation Damping) supplementary ...  Read More

Research Articles Control
Chaos Synchronization in Josephson Junction Using a Nonlinear Model Predictive Controller Based on Particle Filter: Processor in the Loop Implementation

Aylar Khooshehmehri; Saeed Nasrollahi; Morteza Aliyari

Volume 4, Issue 3 , August 2021, Pages 355-366

https://doi.org/10.22111/ieco.2021.36978.1329

Abstract
  In this paper, a model predictive control approach based on a generic particle filter is proposed to synchronize two Josephson junction models with different parameters. For this purpose, an appropriate objective function is defined to assess the particles within the state space. This objective function ...  Read More

Research Articles Power systems
Determining the Necessity and Timing of Controlled Islanding in Power System: a wide-area intelligent-based method

Hojatolah Makvandi; Mahmood Joorabian; Hassan Barati

Volume 4, Issue 3 , August 2021, Pages 367-376

https://doi.org/10.22111/ieco.2021.35777.1304

Abstract
  The present study introduces a new extensive-area ANFIS (Adaptive Neuro-Fuzzy Interface System)-based method to detect wide area instability and control the time of controlled islanding execution within power systems. The ANFIS parameters are optimized by the PSO method to increase the method’s ...  Read More