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Prof. Gevork B. Gharehpetian
Amirkabir University of Technology

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0 Distributed Generation
0 FACTS
0 HVDC
0 Smart Grid
0 microgrids

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Distributed Generation
microgrids
HVDC
FACTS
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Short Biography

Prof. G. B. Gharehpetian received his BS, MS and Ph.D. degrees in electrical engineering in 1987, 1989 and 1996 from Tabriz University, Tabriz, Iran and Amirkabir University of Technology (AUT), Tehran, Iran and Tehran University, Tehran, Iran, respectively, graduating all with First Class Honors. As a Ph.D. student, he has received scholarship from DAAD (German Academic Exchange Service) from 1993 to 1996 and he was with High Voltage Institute of RWTH Aachen, Aachen, Germany. He has been holding the Assistant Professor position at AUT from 1997 to 2003, the position of Associate Professor from 2004 to 2007 and has been Professor since 2007. He was selected by the Ministry of Science Research and Technology (SMRT) as the distinguished professor of Iran, by IAEEE (Iranian Association of Electrical and Electronics Engineers) as the distinguished researcher of Iran, by Iran Energy Association (IEA) as the best researcher of Iran in the field of energy, by the SMRT as the distinguished researcher of Iran, by The Academy of Science of the Islamic Republic of Iran as the distinguished professor of electrical engineering, by National Elites Foundation as the laureates of Alameh Tabatabaei Award and was awarded the National Prize in 2008, 2010, 2018, 2018, 2019 and 2019, respectively. Based on the Web of Science database (2005-2015), he is among world’s top 1% elite scientists according to ESI (Essential Science Indicators) ranking system.

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Research paper
Published: 20 August 2021 in Evolutionary Intelligence
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Currently, the administrators of transportation systems enable the distribution network operator and end-side customers to properly execute demand response programs by installing parking lots and employing the concepts of vehicle-to-grid. In this study, to minimize the voltage drop and power loss in distribution network and several cases, optimal siting, and sizing of smart parking lot (SPL) including photovoltaic system, wind turbine (WT), energy storage system, and diesel generator are modeled as a bi-objective function. Direct load control (DLC) and time of use (TOU) based on the demand response program (DRP) have been used for simulations. In addition, a two-stage optimization algorithm has been devised to solve the optimization problem. In the first stage, all responses to form the Pareto optimal front (the response of each objective) are generated using a genetic algorithm. In the second stage, the best solution is achieved using max –min decision-making method. The results obtained from the simulations revealed that, due to the positive implementation of TOU and DLC of DRP, total technical constraints of SPL-based distribution networks were improved. This means that, power loss and voltage profile objectives are satisfied. All of the simulations are carried out on a 33-buses IEEE system by MATLAB software.

ACS Style

Mehrdad Hajizadeh; G. B. Gharehpetian; Saeid Ghassem Zadeh; Mohammad Tolou Askari. Optimal siting and sizing of electrical vehicle parking lots by considering technical constraints. Evolutionary Intelligence 2021, 1 -15.

AMA Style

Mehrdad Hajizadeh, G. B. Gharehpetian, Saeid Ghassem Zadeh, Mohammad Tolou Askari. Optimal siting and sizing of electrical vehicle parking lots by considering technical constraints. Evolutionary Intelligence. 2021; ():1-15.

Chicago/Turabian Style

Mehrdad Hajizadeh; G. B. Gharehpetian; Saeid Ghassem Zadeh; Mohammad Tolou Askari. 2021. "Optimal siting and sizing of electrical vehicle parking lots by considering technical constraints." Evolutionary Intelligence , no. : 1-15.

Journal article
Published: 18 August 2021 in IEEE Transactions on Industrial Informatics
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Frequency response analysis (FRA) suffers from the interpretation of results despite its potential ability to detect faults related to the power transformer windings. This paper presents a technique for interpreting frequency responses, which is based on image processing and deep learning method and called Graph Convolutional Neural Network (CNN). The proposed procedure transfers frequency responses into 2D images through a visualization technique. The gained images are aggregated into a dataset to be used as the CNN input. The proposed technique is applied on frequency responses of two different winding models with Short Circuit (SC) faults. The SC faults with different intensities are applied on different sections of a simulated ladder model winding and a 20kV winding of a 1.6MVA distribution transformer. After determining the frequency response for each faulty case and applying the visualization technique, the precise locating of SC faults is performed by the CNN. Then, the results are analyzed by performance evaluation metrics. At this stage, the high performance of the CNN in the use of 2D images instead of the conventional method is observed. Finally, by testing the high impedance SC faults in different sections of the simulated winding model and applying the suggested method step by step, early detection of the SC fault is also performed in this study. It should be noted that the suggested technique, in addition to its accuracy and high detection speed, can be considered as an important step in automatic interpretation of frequency responses for online monitoring of transformers

ACS Style

Arash Moradzadeh; Hamed Moayyed; Behnam Mohammadi-Ivatloo; Gevork B. Gharehpetian; A. Pedro Aguiar. Turn-to-Turn Short Circuit Fault Localization in Transformer Winding via Image Processing and Deep Learning Method. IEEE Transactions on Industrial Informatics 2021, PP, 1 -1.

AMA Style

Arash Moradzadeh, Hamed Moayyed, Behnam Mohammadi-Ivatloo, Gevork B. Gharehpetian, A. Pedro Aguiar. Turn-to-Turn Short Circuit Fault Localization in Transformer Winding via Image Processing and Deep Learning Method. IEEE Transactions on Industrial Informatics. 2021; PP (99):1-1.

Chicago/Turabian Style

Arash Moradzadeh; Hamed Moayyed; Behnam Mohammadi-Ivatloo; Gevork B. Gharehpetian; A. Pedro Aguiar. 2021. "Turn-to-Turn Short Circuit Fault Localization in Transformer Winding via Image Processing and Deep Learning Method." IEEE Transactions on Industrial Informatics PP, no. 99: 1-1.

Journal article
Published: 01 August 2021 in Journal of Pipeline Systems Engineering and Practice
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To provide cathodic protection (CP) for gas and oil underground pipelines, a direct current (DC) isolator is needed to isolate the main CP converter from the earth around the pipeline. The DC isolator, proposed in this paper, consists of four parts: a second-order low-pass active filter, voltage level shifter, pulse-width-modulation (PWM) controller, and a ground isolator. This converter is designed to accurately provide an isolated near-ground voltage as a control input of the main CP converter in harsh outdoor environments, which is its privilege in comparison with other solutions. The second-order low-pass active filter is designed to filter possible disturbances in the vicinity of the pipeline and reduce the loading effect of the permanent half-cell resistor. The voltage level shifter provides proper voltage range and increases the precision of the main CP converter. The PWM controller is used to provide alternating current (AC) voltage for ground isolator, and the ground isolator provides enough isolation from the dirty ground near the pipeline. Finally, a prototype is implemented and tested to verify the theoretical and simulation results.

ACS Style

Shokoufeh Valadkhani; Mojtaba Mirsalim; Gevork B. Gharehpetian. Robust Analog DC Isolator for Cathodic Protection Applications. Journal of Pipeline Systems Engineering and Practice 2021, 12, 04021035 .

AMA Style

Shokoufeh Valadkhani, Mojtaba Mirsalim, Gevork B. Gharehpetian. Robust Analog DC Isolator for Cathodic Protection Applications. Journal of Pipeline Systems Engineering and Practice. 2021; 12 (3):04021035.

Chicago/Turabian Style

Shokoufeh Valadkhani; Mojtaba Mirsalim; Gevork B. Gharehpetian. 2021. "Robust Analog DC Isolator for Cathodic Protection Applications." Journal of Pipeline Systems Engineering and Practice 12, no. 3: 04021035.

Journal article
Published: 26 July 2021 in IEEE Access
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Microgrid as the main building block for future smart grids is prone to instability originated from converter-based distributed generations (DG). Herein, we first analyze the small-signal stability of an inverter-interfaced microgrid. Then, a novel adaptive network fuzzy inference system (ANFIS)-based optimization method is introduced which aims at online tuning of virtual inductances (VI) in the islanded microgrids. The data for ANFIS training is drawn by particle swarm optimization (PSO) algorithm and the proposed objective function. A total of 140 load scenarios are considered to provide optimal VI in each load condition and generate optimal data for ANFIS training. This process yields minimizing reactive power mismatches and improves microgrid stability in different load levels. The simultaneous application of PSO algorithm and ANFIS training facilitates the objectives pursued by current study. Finally, the trained ANFIS networks are installed in the converter control. The adaptive performance of ANFIS controllers makes the converters responses independent from load change location and value. The effectiveness of the proposed control methodology is verified using simulations studies.

ACS Style

Bahram Pournazarian; Reza Sangrody; Meysam Saeedian; Oriol Gomis-Bellmunt; Edris Pouresmaeil. Enhancing Microgrid Small-Signal Stability and Reactive Power Sharing Using ANFIS-Tuned Virtual Inductances. IEEE Access 2021, 9, 104915 -104926.

AMA Style

Bahram Pournazarian, Reza Sangrody, Meysam Saeedian, Oriol Gomis-Bellmunt, Edris Pouresmaeil. Enhancing Microgrid Small-Signal Stability and Reactive Power Sharing Using ANFIS-Tuned Virtual Inductances. IEEE Access. 2021; 9 (99):104915-104926.

Chicago/Turabian Style

Bahram Pournazarian; Reza Sangrody; Meysam Saeedian; Oriol Gomis-Bellmunt; Edris Pouresmaeil. 2021. "Enhancing Microgrid Small-Signal Stability and Reactive Power Sharing Using ANFIS-Tuned Virtual Inductances." IEEE Access 9, no. 99: 104915-104926.

Journal article
Published: 20 July 2021 in IEEE Access
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In this paper, a novel pulse tripling circuit (PTC) is suggested, to upgrade a polygon autotransformer 12-pulse rectifier (12-PR) to a 36-pulse rectifier (36-PR) with a low power rating. The kVA rating of the proposed PTC is lower compared to the conventional one (about 1.57% of load power). Simulation and experimental test results show that the total harmonic distortion (THD) of the input current of the suggested 36-PR is less than 3%, which meets the IEEE 519 requirements. Also, it is shown that in comparison with other multi-pulse rectifiers (MPR), it is cost-effective, its power factor is near unity and its rating is about 24% of the load rating. Therefore, the proposed 36-PR can be considered as a practical solution for industrial applications.

ACS Style

Rohollah Abdollahi; Gevork B. Gharehpetian; Amjad Anvari-Moghaddam; Frede Blaabjerg. Pulse Tripling Circuit and Twelve Pulse Rectifier Combination for Sinusoidal Input Current. IEEE Access 2021, 9, 103588 -103599.

AMA Style

Rohollah Abdollahi, Gevork B. Gharehpetian, Amjad Anvari-Moghaddam, Frede Blaabjerg. Pulse Tripling Circuit and Twelve Pulse Rectifier Combination for Sinusoidal Input Current. IEEE Access. 2021; 9 ():103588-103599.

Chicago/Turabian Style

Rohollah Abdollahi; Gevork B. Gharehpetian; Amjad Anvari-Moghaddam; Frede Blaabjerg. 2021. "Pulse Tripling Circuit and Twelve Pulse Rectifier Combination for Sinusoidal Input Current." IEEE Access 9, no. : 103588-103599.

Original research paper
Published: 06 July 2021 in IET Power Electronics
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To increase the power rating and reduce the cost and complexity of a multi-pulse rectifier (MPR), it is well known that the pulse number must be increased. In some practical cases, a 12-pulse rectifier (12PR) is suggested as a good solution considering its relatively simple structure and low weight. However, 12-pulse rectifiers cannot technically meet the standards of harmonic distortion requirements for some industrial applications, and therefore they must be used along with output filters. Two cost-effective 24-pulse rectifiers (24PRs) are suggested in the article, which consist of a polygon autotransformer 12PR and two pulse doubling circuits (PDCs) at dc link. The first PDC (PDC1) is based on an inter-phase transformer (IPT) with a step-up secondary winding, and the second one (PDC2) is based on an IPT with a step-down secondary winding. To show the advantages of the proposed combinations compared with other solutions, simulation results are used, and also a prototype is implemented to evaluate and verify the simulation results. The simulation and experimental test results show that the total harmonic distortion (%THD) of the input current for the 12PR with PDC1 is less than 3.67%, and the 12PR with PDC2 is less than 1.45%, which meets the IEEE 519 and DO-160G requirements. Also, it is shown that in comparison with other solutions, the proposed two configurations are cost-effective, power factor is near unity, rating is almost 29% of the load rating, and the efficiency is almost 97.5%, which makes them a practical solution for more electric aircraft.

ACS Style

R. Abdollahi; G. B. Gharehpetian; A. Anvari‐Moghaddam; F. Blaabjerg. An improved 24‐pulse rectifier for harmonic mitigation in more electric aircraft. IET Power Electronics 2021, 14, 2007 -2020.

AMA Style

R. Abdollahi, G. B. Gharehpetian, A. Anvari‐Moghaddam, F. Blaabjerg. An improved 24‐pulse rectifier for harmonic mitigation in more electric aircraft. IET Power Electronics. 2021; 14 (11):2007-2020.

Chicago/Turabian Style

R. Abdollahi; G. B. Gharehpetian; A. Anvari‐Moghaddam; F. Blaabjerg. 2021. "An improved 24‐pulse rectifier for harmonic mitigation in more electric aircraft." IET Power Electronics 14, no. 11: 2007-2020.

Journal article
Published: 15 June 2021 in Sustainable Energy Technologies and Assessments
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In this paper, a new control method is proposed for microgrid-connected voltage source converters (VSCs), which generally contain voltage and current control loops. The voltage of the point of common coupling (PCC) is analyzed by recursive least squares (RLS) algorithm and its fundamental positive symmetric components are extracted by the voltage control loop. Using the fundamental positive symmetric component, the required active and reactive powers are injected into the main grid via the microgrid-connected VSC without any distortions. This control loop is equipped with two PI controllers for the DC and AC voltage regulation. On the other hand, the same as the PCC voltage assessment, the local load current signal is evaluated by the RLS algorithm in the current control loop, with its harmonics and unbalanced components extracted. Eventually, the reference signal is obtained using these two control loops for generating switching pulses of the microgrid-connected VSC. Accordingly, the VSC acts as a shunt active power filter (APF), and also simultaneously injects the required active and reactive powers to the main grid. The proposed control method has high accuracy and fast dynamic response, and also its performance is independent of system parameters. The effectiveness of the proposed method has been verified by simulation and experiment.

ACS Style

Hamed Joorabli; Gevork B. Gharehpetian; Saeid Ghassem-Zadeh; Vahid Ghods. A new control method for distortions compensation and power control using microgrid connecting voltage source converters. Sustainable Energy Technologies and Assessments 2021, 47, 101373 .

AMA Style

Hamed Joorabli, Gevork B. Gharehpetian, Saeid Ghassem-Zadeh, Vahid Ghods. A new control method for distortions compensation and power control using microgrid connecting voltage source converters. Sustainable Energy Technologies and Assessments. 2021; 47 ():101373.

Chicago/Turabian Style

Hamed Joorabli; Gevork B. Gharehpetian; Saeid Ghassem-Zadeh; Vahid Ghods. 2021. "A new control method for distortions compensation and power control using microgrid connecting voltage source converters." Sustainable Energy Technologies and Assessments 47, no. : 101373.

Review
Published: 08 June 2021 in IEEE Systems Journal
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Microgrids consisting of photovoltaic (PV) power plants and wind farms have been widely accepted in power systems for reliability enhancement and power loss reduction. Microgrids are capable of providing voltage and frequency support, improving power quality, and achieving proper power-sharing. To achieve such goals and deal with the nonlinear behavior in such systems, appropriate robust control strategies are required to be adopted. This article presents a comprehensive review of robust control methods for microgrids, including AC, DC, and hybrid microgrids, with different topologies and different types of interconnection to conventional power systems based on recently published research studies. The main control objectives, along with proposed control methods, are comparatively discussed for different types of microgrids. Furthermore, several research gaps in this area related to the scalability, robustness assessment, and evaluation approach are discussed. Recommendations are made that can potentially open new research lines to enhance the effectiveness of robust controllers for AC, DC, and hybrid microgrids.

ACS Style

Fazel Mohammadi; Behnam Mohammadi-Ivatloo; Gevork B. Gharehpetian; Mohd. Hasan Ali; Wei Wei; Ozan Erdinc; MohammadAmin Shirkhani. Robust Control Strategies for Microgrids: A Review. IEEE Systems Journal 2021, PP, 1 -12.

AMA Style

Fazel Mohammadi, Behnam Mohammadi-Ivatloo, Gevork B. Gharehpetian, Mohd. Hasan Ali, Wei Wei, Ozan Erdinc, MohammadAmin Shirkhani. Robust Control Strategies for Microgrids: A Review. IEEE Systems Journal. 2021; PP (99):1-12.

Chicago/Turabian Style

Fazel Mohammadi; Behnam Mohammadi-Ivatloo; Gevork B. Gharehpetian; Mohd. Hasan Ali; Wei Wei; Ozan Erdinc; MohammadAmin Shirkhani. 2021. "Robust Control Strategies for Microgrids: A Review." IEEE Systems Journal PP, no. 99: 1-12.

Journal article
Published: 25 May 2021 in IEEE Access
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An accurate and real-time knowledge of temperatures in insulated-gate bipolar transistor modules is crucial for reliability analysis and thermal management of power electronic converters. For this purpose, this paper establishes an integrated thermal equivalent circuit model comprising self-heating thermal impedances and cross-heating thermal impedances to provide a temperature profile of the junction and solder joints during various operations and in the case of thermal aging. The thermal resistance and capacitance parameters of the thermal impedances are characterized in terms of different electro-thermal operating conditions and solder joints aging conditions with the help of three-dimensional finite element simulations. Also, the effect of the heatsink, which brings an uneven heat transfer coefficient distribution at the module baseplate, is investigated and modeled into the thermal impedances. The introduced thermal model can work even if the conditions change simultaneously. The accuracy of the model is verified by experiments and finite element simulations, all of which agree with negligible error unlike thermal models given in the datasheet and fixed-parameter thermal models.

ACS Style

Mohsen Akbari; Mohammad Tavakoli Bina; Amir Sajjad Bahman; Bahman Eskandari; Edris Pouresmaeil; Frede Blaabjerg. An Extended Multilayer Thermal Model for Multichip IGBT Modules Considering Thermal Aging. IEEE Access 2021, 9, 84217 -84230.

AMA Style

Mohsen Akbari, Mohammad Tavakoli Bina, Amir Sajjad Bahman, Bahman Eskandari, Edris Pouresmaeil, Frede Blaabjerg. An Extended Multilayer Thermal Model for Multichip IGBT Modules Considering Thermal Aging. IEEE Access. 2021; 9 (99):84217-84230.

Chicago/Turabian Style

Mohsen Akbari; Mohammad Tavakoli Bina; Amir Sajjad Bahman; Bahman Eskandari; Edris Pouresmaeil; Frede Blaabjerg. 2021. "An Extended Multilayer Thermal Model for Multichip IGBT Modules Considering Thermal Aging." IEEE Access 9, no. 99: 84217-84230.

Research article
Published: 11 May 2021 in International Transactions on Electrical Energy Systems
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Double circuit transmission lines (DCTLs) are widely used to endure the reliable and secure connection of the wind power plants (WPPs) to the grid. This article proposes a new double‐circuit bridge‐type fault current limiter (DBFCL) for enhancing fault ride‐through (FRT) capability of WPPs integrated to the grid through DCTLs. It inter‐lines between two circuits of DCTLs. The main advantage of the proposed DBFCL is reducing the number as well as the power rating of components, which reduces the cost and volume of the proposed DBFCL as compared to use of two bridge‐type fault current limiters (BFCLs) in DCTLs. The structure, control, and capability of the proposed DBFCL are discussed in this article. To examine the FRT performance of the proposed DBFCL, the doubly fed induction generator (DFIG)‐based WPPs is used and extensive simulations are executed in PSCAD/EMTDC software. Also, the DBFCL performance is compared with the case of using one BFCL in WPP substation, crowbar, DC link chopper, and series‐resonance fault current limiter (SRFCL) schemes. Simulation results reveal that the DBFCL not only augments the FRT of WPPs with a lower cost, but it also has a superior performance compared with the case of using BFCL in WPP substation. Also, the DBFCL outperforms the crowbar system, the DC link chopper, and the SRFCL.

ACS Style

Ali Azizpour; Masoud Radmehr; Mehdi Firouzi; Gevork B. Gharehpetian. Novel double‐circuit transmission line bridge‐type fault current limiter to enhance wind power plants fault ride‐through capability. International Transactions on Electrical Energy Systems 2021, 31, e12933 .

AMA Style

Ali Azizpour, Masoud Radmehr, Mehdi Firouzi, Gevork B. Gharehpetian. Novel double‐circuit transmission line bridge‐type fault current limiter to enhance wind power plants fault ride‐through capability. International Transactions on Electrical Energy Systems. 2021; 31 (8):e12933.

Chicago/Turabian Style

Ali Azizpour; Masoud Radmehr; Mehdi Firouzi; Gevork B. Gharehpetian. 2021. "Novel double‐circuit transmission line bridge‐type fault current limiter to enhance wind power plants fault ride‐through capability." International Transactions on Electrical Energy Systems 31, no. 8: e12933.

Review
Published: 10 May 2021 in IEEE Access
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Global warming and the desire to increase the use of clean energy have led to increasing the installation and operation of renewable energy power plants (REPPs), especially large-scale photovoltaic (PV) farms (LPFs). Given that the LPFs are added to power system or replace conventional power plants, they must be able to perform the basic tasks of synchronous generators (SGs). One of these tasks is the ability to mitigate the low-frequency oscillation (LFO) risk. Also, one of the LPFs problems is reducing the power system inertia and increasing the risk of LFOs. Therefore, these types of power plants must damp the LFOs through a power oscillation damping controller (PODC), similar to the performance of power system stabilizers (PSSs) in the SGs. This paper represents an overview of the different PODCs and control methods for LFOs damping by LPF. It seems that it can be a driver for future studies. Different studies show that the application of PODCs for LPFs can play an effective role to damp the LFOs and increase the power system stability.

ACS Style

Mahdi Saadatmand; Gevork B. Gharehpetian; Ali Moghassemi; Josep M. Guerrero; Pierluigi Siano; Hassan Haes Alhelou. Damping of Low-Frequency Oscillations in Power Systems by Large-Scale PV Farms: A Comprehensive Review of Control Methods. IEEE Access 2021, 9, 72183 -72206.

AMA Style

Mahdi Saadatmand, Gevork B. Gharehpetian, Ali Moghassemi, Josep M. Guerrero, Pierluigi Siano, Hassan Haes Alhelou. Damping of Low-Frequency Oscillations in Power Systems by Large-Scale PV Farms: A Comprehensive Review of Control Methods. IEEE Access. 2021; 9 (99):72183-72206.

Chicago/Turabian Style

Mahdi Saadatmand; Gevork B. Gharehpetian; Ali Moghassemi; Josep M. Guerrero; Pierluigi Siano; Hassan Haes Alhelou. 2021. "Damping of Low-Frequency Oscillations in Power Systems by Large-Scale PV Farms: A Comprehensive Review of Control Methods." IEEE Access 9, no. 99: 72183-72206.

Journal article
Published: 19 April 2021 in IEEE Transactions on Power Electronics
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High Voltage Direct Current (HVDC) systems are now well-integrated into AC systems in many jurisdictions. The integration of Renewable Energy Sources (RESs) is a major focus and the role of HVDC systems is expanding. However, the protection of HVDC systems against DC faults is a challenging issue that can have negative impacts on the reliable and safe operation of power systems. Practical solutions to protect HVDC grids against DC faults without a widespread power outage include (1) using DC Circuit Breakers (CBs) to isolate the faulty DC-link, (2) using a proper converter topology to interrupt the DC fault current, and/or (3) using high power DC transformers and DC hubs at strategic points within DC grids. The application of HVDC CBs is identified as the best approach that satisfies both DC grids and connected AC grids requirements. This paper reports a comprehensive review of HVDC CBs technologies, including recent significant attempts in the development of modern HVDC CBs. The functional analysis of each technology is presented. Additionally, different technologies based on information obtained from literature are compared. Finally, recommendations for the improvement of CBs are presented.

ACS Style

Fazel Mohammadi; Kumars Rouzbehi; Masood Hajian; Kaveh Niayesh; Gevork B. Gharehpetian; Hani Saad; Mohd. Hasan Ali; Vijay K. Sood. HVDC Circuit Breakers: A Comprehensive Review. IEEE Transactions on Power Electronics 2021, 36, 13726 -13739.

AMA Style

Fazel Mohammadi, Kumars Rouzbehi, Masood Hajian, Kaveh Niayesh, Gevork B. Gharehpetian, Hani Saad, Mohd. Hasan Ali, Vijay K. Sood. HVDC Circuit Breakers: A Comprehensive Review. IEEE Transactions on Power Electronics. 2021; 36 (12):13726-13739.

Chicago/Turabian Style

Fazel Mohammadi; Kumars Rouzbehi; Masood Hajian; Kaveh Niayesh; Gevork B. Gharehpetian; Hani Saad; Mohd. Hasan Ali; Vijay K. Sood. 2021. "HVDC Circuit Breakers: A Comprehensive Review." IEEE Transactions on Power Electronics 36, no. 12: 13726-13739.

Review
Published: 06 April 2021 in Energies
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There are some environmental factors, such as ambient temperature, dust, etc., which cause a reduction in the efficiency of Photovoltaic (PV) systems. Installation of PV panels on the water surface, commonly known as Floating Photovoltaic (FPV) systems, is one solution to employ PV panels in a cooler environment, achieve higher efficiency, and reduce water evaporation. FPV systems open up new opportunities for scaling up solar generating capacity, especially in countries with high population density and valuable lands, as well as countries with high evaporation rates and water resources deficiency. Since the FPV system is an almost new concept, its cleaning techniques have not been comprehensively studied. While FPV systems are located on the surface of water resources and reservoirs, the water quality can limit the application of different cleaning techniques. Therefore, this paper investigates different techniques of FPV systems cleaning and categorizes them into water-based and water-free approaches. In addition, their cleaning frequencies, as well as economic aspects, are presented and discussed to determine their merits and demerits for using them in FPV systems.

ACS Style

Rafi Zahedi; Parisa Ranjbaran; Gevork Gharehpetian; Fazel Mohammadi; Roya Ahmadiahangar. Cleaning of Floating Photovoltaic Systems: A Critical Review on Approaches from Technical and Economic Perspectives. Energies 2021, 14, 2018 .

AMA Style

Rafi Zahedi, Parisa Ranjbaran, Gevork Gharehpetian, Fazel Mohammadi, Roya Ahmadiahangar. Cleaning of Floating Photovoltaic Systems: A Critical Review on Approaches from Technical and Economic Perspectives. Energies. 2021; 14 (7):2018.

Chicago/Turabian Style

Rafi Zahedi; Parisa Ranjbaran; Gevork Gharehpetian; Fazel Mohammadi; Roya Ahmadiahangar. 2021. "Cleaning of Floating Photovoltaic Systems: A Critical Review on Approaches from Technical and Economic Perspectives." Energies 14, no. 7: 2018.

Research paper
Published: 01 April 2021 in Iranian Journal of Science and Technology, Transactions of Electrical Engineering
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Diesel generator emulators (DGEs) are commonly used instead of real diesel generator units in laboratory-scale studies for their lower noise, more flexible parameters design and lower environmental pollution. This study presents a new control system in αβ framework for a DGE based on power electronic converter. The proposed control system has two parallel control paths including the frequency path and the voltage path. The voltage path consists of a PI controller that generates the amplitude of the modulation reference waveform. The frequency path consists of a transfer function in series with a droop curve to generate the angle of the modulation reference waveform. Finally, the angle and amplitude are applied to an especial space vector modulation unit for generation of the inverter gate pulses. The presented algorithm can be simply implemented in αβ framework with no need to PLL system and park transformation. It employs just one PI controller which can be easily implemented and tuned on the microcontroller. The experimental and simulation results verify the accuracy and performance of the proposed method.

ACS Style

M. S. Mahdavi; G. B. Gharehpetian; Ali Ghasemi. An Enhanced Converter-based Diesel Generator Emulator for Voltage and Frequency Control Studies in Laboratory-Scale Microgrids. Iranian Journal of Science and Technology, Transactions of Electrical Engineering 2021, 1 -13.

AMA Style

M. S. Mahdavi, G. B. Gharehpetian, Ali Ghasemi. An Enhanced Converter-based Diesel Generator Emulator for Voltage and Frequency Control Studies in Laboratory-Scale Microgrids. Iranian Journal of Science and Technology, Transactions of Electrical Engineering. 2021; ():1-13.

Chicago/Turabian Style

M. S. Mahdavi; G. B. Gharehpetian; Ali Ghasemi. 2021. "An Enhanced Converter-based Diesel Generator Emulator for Voltage and Frequency Control Studies in Laboratory-Scale Microgrids." Iranian Journal of Science and Technology, Transactions of Electrical Engineering , no. : 1-13.

Journal article
Published: 17 March 2021 in IEEE Access
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Unexpected natural disasters or physical attacks can have various consequences, including extensive and prolonged blackouts on power systems. Energy systems should be resistant to unwanted events, and their performance is not easily affected by such conditions. The power system should also have sufficient flexibility to adapt to severe disturbances without losing its full version; it should restore itself immediately after resolving the disturbance. This critical feature of the behavior of infrastructure systems in power grids is called resilience. In this paper, the concepts related to resilience in the power system against severe disturbance are explained. The resilience and evaluation process components are introduced; then, an optimal design of resilient substations in the Noorabad city distribution grid against physical attack is presented. This research proposes an optimal solution for simultaneously allocating the feeder routing issue and substation facilities and finding the models of installed conductors and economic hardening of power lines due to unexpected physical attacks on vital urban operational infrastructure. The values of distribution networks are calculated using the grey wolf optimization (GWO) algorithm to solve the problem of designing an optimal distribution network scheme (ODNS) and optimal resilient distribution network scheme (ORDNS). Obtained results confirm the effectiveness of the proposed resiliency-cost-based optimization approach.

ACS Style

Mohammad Ghiasi; Moslem Dehghani; Taher Niknam; Hamid Reza Baghaee; Sanjeevikumar Padmanaban; Gevork B. Gharehpetian; Hamdulah Aliev. Resiliency/Cost-Based Optimal Design of Distribution Network to Maintain Power System Stability Against Physical Attacks: A Practical Study Case. IEEE Access 2021, 9, 43862 -43875.

AMA Style

Mohammad Ghiasi, Moslem Dehghani, Taher Niknam, Hamid Reza Baghaee, Sanjeevikumar Padmanaban, Gevork B. Gharehpetian, Hamdulah Aliev. Resiliency/Cost-Based Optimal Design of Distribution Network to Maintain Power System Stability Against Physical Attacks: A Practical Study Case. IEEE Access. 2021; 9 ():43862-43875.

Chicago/Turabian Style

Mohammad Ghiasi; Moslem Dehghani; Taher Niknam; Hamid Reza Baghaee; Sanjeevikumar Padmanaban; Gevork B. Gharehpetian; Hamdulah Aliev. 2021. "Resiliency/Cost-Based Optimal Design of Distribution Network to Maintain Power System Stability Against Physical Attacks: A Practical Study Case." IEEE Access 9, no. : 43862-43875.

Journal article
Published: 12 March 2021 in IEEE Systems Journal
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Insufficient inertia is the paramount challenge in power system transition toward $ 100\%$ converter-based generation. A promising solution to this issue is utilizing distributed virtual inertia (DVI) concept, i.e., releasing energy stored in the dc-link capacitors of power converters employed in the grid following a frequency disturbance. Nevertheless, this method has two drawbacks: $ 1$ ) the dc-link voltage is not reverted to its reference value after the power mismatch between generation and demand, and $ 2$ ) it yields instability of a local mode associated with the control system when the converter operates in weak grids. To overcome the aforesaid problems, the conventional DVI loop is modified so as not to affect the outer loop voltage regulator after transient. Moreover, an efficient compensator is presented in this article which eliminates the adverse impact of DVI technique on the converter stability in weak grid connections. The efficacy of proposed control scheme is depicted by simulations in MATLAB. The results illustrate that an improvement of $ 23\%$ is evident in the grid frequency rate of change following a frequency contingency collated with the case in which the DVI loop staying nullified.

ACS Style

Meysam Saeedian; Bahram Pournazarian; Shamsodin Taheri; Edris Pouresmaeil. Provision of Synthetic Inertia Support for Converter-Dominated Weak Grids. IEEE Systems Journal 2021, PP, 1 -10.

AMA Style

Meysam Saeedian, Bahram Pournazarian, Shamsodin Taheri, Edris Pouresmaeil. Provision of Synthetic Inertia Support for Converter-Dominated Weak Grids. IEEE Systems Journal. 2021; PP (99):1-10.

Chicago/Turabian Style

Meysam Saeedian; Bahram Pournazarian; Shamsodin Taheri; Edris Pouresmaeil. 2021. "Provision of Synthetic Inertia Support for Converter-Dominated Weak Grids." IEEE Systems Journal PP, no. 99: 1-10.

Journal article
Published: 08 March 2021 in IEEE Systems Journal
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Inherent nonlinearities and uncertainties are inseparable parts of the real-life engineering systems, which make theoretical analyzes and control system designs more challenging. Usually, most of the physical parts in control systems such as controllers and actuators are subjected to saturation. On the other hand, uncertainties are ubiquitous in the physical systems, which demand some necessities in the design of the control system. Additionally, unreliability in communication networks is another practical constraint in multiagent systems, which is required to be considered. In this article, based on the mentioned issues, a distributed robust algorithm is proposed for the semiglobal stabilization of the voltage and frequency of isolated (islanded) ac microgrids considering parameters uncertainties, static nonlinearity of actuators, and unreliability in the communication network. In this regard, by employing an adaptive low-gain feedback protocol, the robust performance of the closed-loop system is guaranteed. Finally, to evaluate the proposed control strategy’s performance, digital time-domain simulations are carried out on a test microgrid system in MATLAB/Simulink environment, and the results are compared with several previously reported methods. Simulation results and comparison with previous works reveal the proposed method’s effectiveness and accuracy in regulating the microgrid voltage/frequency and providing accurate proportional active power sharing.

ACS Style

Amir Afshari; Mehdi Karrari; Hamid Reza Baghaee; Gevork B. Gharehpetian; Josep M. Guerrero. Robust Cooperative Control of Isolated AC Microgrids Subject to Unreliable Communications: A Low-Gain Feedback Approach. IEEE Systems Journal 2021, PP, 1 -12.

AMA Style

Amir Afshari, Mehdi Karrari, Hamid Reza Baghaee, Gevork B. Gharehpetian, Josep M. Guerrero. Robust Cooperative Control of Isolated AC Microgrids Subject to Unreliable Communications: A Low-Gain Feedback Approach. IEEE Systems Journal. 2021; PP (99):1-12.

Chicago/Turabian Style

Amir Afshari; Mehdi Karrari; Hamid Reza Baghaee; Gevork B. Gharehpetian; Josep M. Guerrero. 2021. "Robust Cooperative Control of Isolated AC Microgrids Subject to Unreliable Communications: A Low-Gain Feedback Approach." IEEE Systems Journal PP, no. 99: 1-12.

Research article
Published: 01 March 2021 in International Transactions on Electrical Energy Systems
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In this study, a novel method is proposed for current control (CC) of an active power filter (APF) of the aircraft power system, which is based on a fuzzy inference system (FIS). The control system is designed according to the instantaneous power theory. Two other conventional CC methods consisting of the hysteresis current control method (HCCM) and adaptive hysteresis current control method (AHCCM) are utilized in the study and their results are compared with the proposed fuzzy current control method (PFCCM). It is shown that the proposed method is more successful in eliminating harmonics without drawbacks of conventional methods such as high and variable switching frequency which hardens system design and utilization. The study is carried out in MATLAB\Simulink environment to prove the applicability of the proposed method.

ACS Style

Hamid Radmanesh; Gevork B. Gharehpetian. Harmonic distortion reduction of commercial airplane electrical power system using fuzzy logic based current control of active power filter. International Transactions on Electrical Energy Systems 2021, e12811 .

AMA Style

Hamid Radmanesh, Gevork B. Gharehpetian. Harmonic distortion reduction of commercial airplane electrical power system using fuzzy logic based current control of active power filter. International Transactions on Electrical Energy Systems. 2021; ():e12811.

Chicago/Turabian Style

Hamid Radmanesh; Gevork B. Gharehpetian. 2021. "Harmonic distortion reduction of commercial airplane electrical power system using fuzzy logic based current control of active power filter." International Transactions on Electrical Energy Systems , no. : e12811.

Journal article
Published: 22 February 2021 in Energies
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In this paper, the virtual synchronous generator (VSG) concept is utilized in the controller of the grid-connected dual two-level voltage source inverter (DTL VSI). First, the topology of the VSG and the DTL VSI are presented. Then, the state-space equations of the DTL VSI and the grid-connected two-level voltage source inverter (TL VSI), regarding the presence of the phase-locked loop (PLL) and the VSG, are given. Next, the small-signal modeling of the DTL VSI and the TL VSI is realized. Eventually, the stability enhancement in the DTL VSI compared with the TL VSI is demonstrated. In the TL VSI, large values of virtual inertia could result in oscillations in the power system. However, the ability of the DTL VSI in damping oscillations is deduced. Furthermore, in the presence of nonlinear loads, the potentiality of the DTL VSI in reducing grid current Total Harmonic Distortion (THD) is evaluated. Finally, by using a proper reference current command signal, the abilities of the DTL VSI and the TL VSI in supplying nonlinear loads and providing virtual inertia are assessed simultaneously. The simulation results prove the advantages of the DTL VSI compared with the TL VSI in virtual inertia emulation and oscillation damping, which are realized by small-signal analysis.

ACS Style

Mohammad Dashtaki; Hamed Nafisi; Amir Khorsandi; Mojgan Hojabri; Edris Pouresmaeil. Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study. Energies 2021, 14, 1160 .

AMA Style

Mohammad Dashtaki, Hamed Nafisi, Amir Khorsandi, Mojgan Hojabri, Edris Pouresmaeil. Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study. Energies. 2021; 14 (4):1160.

Chicago/Turabian Style

Mohammad Dashtaki; Hamed Nafisi; Amir Khorsandi; Mojgan Hojabri; Edris Pouresmaeil. 2021. "Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study." Energies 14, no. 4: 1160.

Journal article
Published: 17 February 2021 in IEEE Transactions on Power Delivery
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Inertia requirement is the paramount challenge in future power systems with a significant share of renewable energy generators. A promising solution to this issue is applying Distributed Virtual Inertia (DVI) concept, i.e. releasing energy preserved in the dc-link capacitors of employed power converters in the grid following a frequency disturbance. Nonetheless, small-signal stability analyses affirm that a local mode associated with the control system is prone to become unstable when the grid-interactive converter augmented with the DVI operates in weak grids. To overcome this problem, an efficient compensator is proposed in this paper. This compensator introduces one degree-of-freedom to the direct axis current controller in synchronous reference frame, which eliminates the adverse impact of DVI function on converter stability. Finally, the efficacy of the proposed control framework is depicted by simulations in MATLAB. The results illustrate that the grid frequency rate of change following a disturbance is improved by 30% compared to the case in which the DVI loop is nullified.

ACS Style

Meysam Saeedian; Reza Sangrody; Mahdi Shahparasti; Shamsodin Taheri; Edris Pouresmaeil. Grid-Following DVI-Based Converter Operating in Weak Grids for Enhancing Frequency Stability. IEEE Transactions on Power Delivery 2021, PP, 1 -1.

AMA Style

Meysam Saeedian, Reza Sangrody, Mahdi Shahparasti, Shamsodin Taheri, Edris Pouresmaeil. Grid-Following DVI-Based Converter Operating in Weak Grids for Enhancing Frequency Stability. IEEE Transactions on Power Delivery. 2021; PP (99):1-1.

Chicago/Turabian Style

Meysam Saeedian; Reza Sangrody; Mahdi Shahparasti; Shamsodin Taheri; Edris Pouresmaeil. 2021. "Grid-Following DVI-Based Converter Operating in Weak Grids for Enhancing Frequency Stability." IEEE Transactions on Power Delivery PP, no. 99: 1-1.