Gevork B. Gharehpetian

• Professor
• Professor at Amirkabir University of Technology

Smart energy networks (SENs) face numerous challenges related to security, reliability, operational uncertainties, and increasing penetration of renewable energies (REs), necessitating advanced methodologies for adequacy and security assessment. This study delves into the utilization of machine learning-driven approaches (MLDAs) to quantify reliabi...

Transformerless high-gain dc–dc converters, such as dual-duty-triple-mode (DDTM) converters, are employed in various applications, including dc microgrids and renewable energy systems. The main feature of DDTM converters is their flexibility in achieving a high voltage gain through various duty cycle combinations. However, due to the utilization of...

The integration of renewable energy sources into the electricity grid has created new challenges and opportunities in the realm of ancillary services. With the increasing penetration of variable energy resources, such as wind and solar power, grid operators are facing complex and dynamic demands for grid stability and reliability. The “power-to-X”...

The rapid growth of battery electric vehicles (BEVs) usage causes severe challenges for charging infrastructure. Despite the numerous merits of stationary energy storage systems (SESSs) for charging BEVs, they cannot solve all challenges for financers and EV customers because SESSs involve a series of limitations, such as the lack of proper electri...

Recent research studies have shown the advantages of using double-skin façade (DSF) and phase change material (PCM) in reducing the amount of building heat, especially for tropical and subtropical climates. Also, by adding photovoltaic (PV) cells in the facade of buildings, the solar heat of the building can be reduced and the electricity generated...

This article offers a design of simultaneous reactive-active power control, total harmonic distortion reduction, and voltage unbalance compensation at the connection point of an industrial-residential microgrid, containing an electric arc furnace and a wind farm, to a power system. As large reactive power consumers, arc furnaces have a completely n...

This study examines the impact of smart transformers on the optimal management of microgrids within a combined heat and power framework. Utilizing a Genetic Algorithm for optimization, the research identifies optimal settings for control variables and resource capacities. The integration of smart transformers significantly enhances performance, imp...

One of the intrinsic properties of Distribution networks, resilience, is the ability to resist, adjust, and recover from extreme, high-impact, low-probability events such as earthquakes, floods, hurricanes, thunderstorms, and cyber and physical attacks. Besides, the uncertainty of the network elements has a significant effect on the operation of th...

This paper proposes a novel method for open-circuit fault detection and localization (OCFDL) in CLLC converters, which is characterized by high speed and independence from output load. The precise location of the open-circuit fault (OCF) is rapidly identified using voltage waveforms across the terminals of the resonance tank capacitor. After fault...

In this paper, a multi-microgrid (MMG) system consisting of three microgrids (MGs), each with three nano grids (NGs) and one central battery storage unit, is modeled to pursue multiple objectives in on-grid and off-grid modes by implementing control strategies in d-q frame. When the MMG is connected to the upstream grid, all three MGs are responsib...

Due to the inherent slow response time of diesel generators within an islanded microgrid (MG), their frequency and voltage control systems often struggle to effectively manage rapid load changes. To mitigate this challenge, energy storage systems (ESSs) emerge as pivotal solutions. Flywheel energy storage systems (FESSs) are well-suited for handlin...

On highways and at the end of distribution feeders, DC fast charging stations (DCFCs) are commonly located. As a result, charging electric vehicles (EVs) at these stations results in a reduction in power quality, including a drop in network voltage. This paper proposes an integrated control system for DCFCs utilizing microgrid (MG) capabilities. Th...

This article proposes a distributed self-triggered mechanism (DSTM) as a novel secondary control approach for ac heterogeneous autonomous microgrids (MGs) with switching communication topologies, aiming to reduce computation, and communication demands. According to the presented DSTM, each distributed energy resource is equipped with a local algori...

This study investigates the production of green hydrogen in the southern coastal cities of Iran, leveraging local advantages. These include the high potential for photovoltaic generation, the need for desalination power plants, and access to the sea and ports, all of which make the southern coasts of Iran favorable for green hydrogen production. Ho...

In this article, a multifunction control scheme is proposed for battery energy storage system (BESS) as an independent grid-supporting distributed energy resource in islanded/stand-alone microgrids (MGs) including synchronous generator. The proposed controller increases the utilization factor of the BESS to participate in electricity market ancilla...

the need for intermediaries, thereby reducing transaction costs and increasing the speed of energy exchanges [3]. More importantly, Blockchain enhances the integrity of data exchanged between grid entities, ensuring that the network is less vulnerable to cyber-attacks and fraud. This has proven crucial in bolstering consumer trust in decentralized...

The emergence of smart grids and microgrids, driven by the integration of distributed energy resources, renewable energy sources, electric vehicles, and energy storage systems, has initiated a transformative shift in the power industry. The intelligence of these advanced grids hinges on the seamless integration of information and communication tech...

As energy systems become increasingly digitized and interconnected, smart grids and microgrids represent the forefront of modern energy infrastructure, leveraging advanced communication technologies, sensors, and digital tools to optimize energy distribution and consumption. However, the growing reliance on these technologies also introduces signif...

Coronavirus disease 2019 (COVID-19) has affected not only individual lives but also the world and global systems, both natural and human-made. Besides millions of deaths and environmental challenges, the rapid spread of the infection and its very high socioeconomic impact have affected healthcare, economic status and wealth, and mental health acros...

One crucial requirement for power systems is the necessity to enhance flexibility, enabling the seamless integration of a substantial amount of renewable energy generation. While flexibility holds significance in current power systems, the escalating penetration of renewable energy resources emphasizes an ongoing and growing need for flexibility in...

This paper proposes a new high gain step-up non-isolated transformer-less DC-DC converter, achieved through the effective integration of an active switched-inductor network with switched-capacitors. A substantially high voltage gain is achieved considering the quantity of components employed in its structure. Benefiting from double duty cycles, a n...

As the optimal size of the battery energy storage system (BESS) affects microgrid operation economically and technically, this paper focuses on a novel BESS sizing model. This model is based on the battery degradation process (BDP) and it can consider temperature impact on the BESS performance. The proposed model aims to accurately minimize microgr...

The modern power system is progressing from a system based on synchronous generators toward systems with high penetration of renewable energy sources (RESs) such as photovoltaic (PV) and wind power generating units which are connected to the grid through inverters. RES units will represent a significant share of the power generation in near future;...

Wind power generation forecasting is a crucial aspect in renewable energy industry since accurate predictions of wind power generation can support the power grid operators and power plant owners to optimize their energy resources management. This will potentially reduce the purchase of extra electricity from other stakeholders or neighboring countr...

With rapid development of high voltage direct current (HVDC) grids, hybrid circuit breakers (HCBs) have gained more attentions, due to their great ability for fault current interruption in HVDC grids. This paper proposes a novel low-cost HCB based on the coupled inductor, to be utilized in HVDC applications. To realize high current breaking capabil...

Power Density is an integral aspect of today's Power Electronics. Switched Capacitor (Charge Pump) Converters offer High power density and efficiency. However their applications have been limited to smaller powers as a result of extensive surge current circulating between the capacitors. In my latest Conference Paper, I've offered a topology of INT...

Microgrids have appeared as a feasible remedy for the energy sector and increase energy demand and climate change issues. These distributed energy networks combine local energy resources, advanced storage systems and intelligent management for independent work or communication with central networks. In this article, it is intended to examine the un...

In the last decade, the water and electricity industry has experienced significant investments in smart grid technologies. Within a smart grid framework, information and energy engage in bidirectional transmission, opening up diverse applications for artificial intelligence, including artificial neural networks, machine learning, and deep learning....

In response to the escalating demand for solar energy, driven by the depletion of fossil resources and their environmental repercussions, numerous studies have been undertaken to enhance the tracking of the maximum power point, optimizing the utilization of solar cell power. Controllers such as P&O, INC, and Fuzzy Logic have been subjects of invest...

This paper proposes obtaining maximum and minimum daily cumulative energy curves and introduces novel hourly and daily energy flexibility indices. Also, it develops a generic methodology that quantifies and formulates energy flexibility as the possible power increase (P_in) or decrease (P_dec) within operational limits. The proposed method can be a...

Nowadays, the use of renewable generations, energy storage systems (ESSs) and microgrids (MGs) has been developed due to better controllability of distributed energy resources (DERs) as well as their cost-effective and emission-aware operation. The development of MGs as well as the use of hierarchical control has led to data transmission in the com...

This paper focuses on the control of unified interphase power controller (UIPC) in isolated hybrid microgrids (HmGs), where the UIPC is used as the main component for interconnecting of AC and DC sub-grids. The investigated HmG encompasses two AC sub-grids and one purely storage DC sub-grid (PSDC) and multiple adjustable loads. A robust nonlinear m...

Microelectronics play a vital role in the next generation of Smart Cities (SCs), Smart Grids (SGs) and Industry 5.0 due to their provision of computing power, storage capacity, and connectivity required to sustain these intricate systems. Moreover, microelectronics are essential for advancing technologies like artificial intelligence, machine learn...

This study presents a novel cubic step-up DC-DC converter that offers a substantial voltage gain. It is well-suited for applications requiring high voltage amplification at low-duty cycles, such as a fuel cell step-up converter. Furthermore, the converter can achieve a compact form factor due to the absence of a transformer. In addition, there is a...

This study introduces a novel quadratic step-up DC-DC converter, designed to provide significant voltage gain. The absence of a transformer enables a compact design, and a common ground between the input and output enhances its applicability. The paper derives equations describing the converter, discusses both ideal and non-ideal operational scenar...

Hybrid circuit breakers (HCBs) play a vital role in developing multi-terminal HVDC (MT-HVDC) systems, owing to their favorable features of fast fault current isolation and low on-state losses. In HCBs, the way of commutation of the fault current and the configuration of the main breaker branch have a significant impact on the performance of interru...

Detecting false data injection (FDI) attacks poses a significant challenge in smart microgrids. Recently, classification algorithms have been employed to address this issue. However, the effectiveness of these methods is hindered by the similarity between normal states and attack states. Consequently, the classification algorithm's accuracy is low,...