Sajjad Tohidi

University of Tabriz · Faculty of Electrical and Computer Engineering

This paper optimizes the stochastic day-ahead planning of an energy hub considering the carbon capture system, energy and carbon markets and flexible loads to achieve a sustainable economical-environmental operation. In the presented model, the cap and trade concept as a successful policy in the regulatory programs of governments is considered to l...

The interconnection between different energy networks considerably improves their technical and economical aspects; however, it increases the complexity of decisions. This paper optimizes the short-term planning of a hybrid multi-microgrid integrated with an all-in-one vehicle station composed of charging facilities, battery swapping slots, parking...

Low-voltage ride-through (LVRT) is one of the most important criteria for integrating wind energy into the power grid. Based on grid connection codes, wind generators must remain connected during fault conditions. However, this requires a careful protection scheme design for addressing the successful ride through of the brushless doubly fed inducti...

The presence of green technologies has increased in recent years due to their efficiency and capability to mitigate environmental issues. This paper evaluates the day-ahead planning of an energy hub integrated with the on-site hydrogen fueling station and active battery swapping infrastructure considering the high level of renewable energies. Accor...

The energy hub applications have been investigated from different perspectives in recent years due to their benefits such as high flexibility and reliability. This paper proposes a two‐stage stochastic programming to enable the participation of a virtual energy hub integrated with parking lots in the electrical and thermal energy markets under the...

Recently, due to the increase of the frequency of high impact low probability (HILP) events (manmade and natural events), assessment and enhancement of resilience has become very important in the operation and planning procedures of future power systems. In this regard, several researches have been conducted on operation and planning strategies of...

Hybrid energy systems can improve the economical and technical aspects of different infrastructures due to their high efficiency and flexibility. In this study, the energy management of a hybrid green residential complex composed of renewable resources, electric boiler/chiller, and electrical storage is optimized considering adaptive parking lots,...

The study provided a techno-economic optimization technique for acquiring the ideal battery storage capacity in conjunction with a solar array capable of meeting the desired residential load with high levels of self-sufficiency. Moreover, the viability of a proposed photovoltaic battery system was evaluated. With a resolution of one minute, the ann...

The paper carried out a techno-economic analysis in order to obtain the optimum battery storage capacity in conjunction with a photovoltaic array that can match the desired household load at highest possible self-consumption. In addition, it determined the economic feasibility of a proposed micro-system. Annual energy consumption, irradiance, and a...

The electrolysis of renewable energy to produce hydrogen has become a strategy for supporting a decarbonized economy. However, it is typically not cost-effective compared to conventional carbon-emitting methods. Due to the predicted intermediate of low-and zero-marginal-cost renewable energy sources, the ability of electrolysis to connect with elec...

Energy hubs by interconnecting various energy systems give rise to the multi carrier energy (MCE) system, as the upcoming energy providing system. The appropriate design and operation of microgrids (MGs) are essential in the MCE systems. In this paper, the self-adequacy improvement of MG within an MCE system is got under studied while achieving an...

This paper investigates the impacts of conservation voltage reduction (CVR) on electricity prices, the local market, and technical issues in distribution networks. An increase in electricity demand is one of the key challenges for developing sustainable societies. An increase in electric consumption puts immense pressure on electricity providers, w...

Abstract The security of energy systems has always been one of the most important issues of energy systems operation. The multi‐carrier multi‐microgrid (MCMMG) is one of the novel structures in the power system. High penetration of renewable resources and their uncertainty, their ability to operate in isolation mode, and the presence of energy hubs...

The paper discusses the feasibility of the use solar energy into hydrogen production using a photovoltaic energy system in the four main cities of Iraq. An off-grid photovoltaic system with a capacity of 22.0 kWp, an 8.0 kW alkaline electrolyser, a hydrogen compressor, and a hydrogen tank were simulated for one year in order to generate hydrogen. A...

In the article, the viability of adopting photovoltaic energy systems to convert solar energy into hydrogen in Iraqi four main cities are examined. A 22 kWp off-grid solar system, an 8 kW alkaline electrolyzer, a hydrogen compressor, and a hydrogen tank were modeled for an entire year in order to produce hydrogen. Using hourly experimental weather...

Integration of different infrastructures has become an interesting subject due to many advantages such as high flexibility and reliability. However, interconnection and coordination of components create critical challenges. In this paper, the day-ahead planning of a renewable multi-carrier system composed of various resources, loads and storage uni...

In this paper, a market-clearing framework based on power tracing and loss allocation has been introduced. Growth in the participation of multiple prosumers in the distribution level with diverse sets of distributed energy resources (DERs) needs to be addressed by considering technical and economic factors in the proposed framework. The grid inform...

The environmental pollution problem is intensified in recent years due to increasing fossil fuel consumption. In this regard, deployment of renewable resources can be a practical solution to decrease greenhouse gases and global warming. This paper proposes a risk-aware multi-objective programming consisting of operation cost and pollution objective...

Loss of excitation (LOE) protection of synchronous generators in power systems equipped with flexible AC transmission systems (FACTS) such as static synchronous compensator (STATCOM) has been a very challenging task. This paper presents a novel approach to the protection of generator in the presence of STATCOM using signal processing and support ve...

Due to the increase in global warming and environmental pollution, heavy penalties have been imposed on pollution producers such as electrical energy networks. Hence, the role of renewable resources expansion in power systems is unavoidable. However, their high penetration increases the uncertainties and decreases the reliability. This paper invest...

Free sources such as seawater and solar and wind energy can be converted by interface equipment for different applications. Due to the development of technologies in recent years, such a process has become more feasible. This paper optimizes the scheduling of a renewable energy-water nexus based on multi-hub concept towards achieving sustainability...

This paper introduces a new trading mechanism for future transactive distribution systems with multiple private microgrids. An independent economic entity as a third-party agent is designed to facilitate the secure information sharing and providing fair market among participants in the transactive system. Proposed trading mechanism is based on doub...

Access to the power system information in the shortest time with the highest accuracy has become critical because of changing the system dimension, cyber-physical issues and increasing data points. This paper evaluates the security and observability of distribution systems under two-level modelling consist of power system observability and security...

Renewable energies are extensively utilized in smart grids. Due to the widespread use of information and communication technologies in such networks, their security has become a critical issue. This paper aims to enhance the information security of renewable smart grids under cyber-physical attacks. In this regard, it is assumed that the non-legiti...

In this paper, a single-phase bridgeless electrolytic capacitor-less single-stage battery charger is proposed to be used in light electric vehicles. The proposed charger consists of a bridgeless power factor corrector (PFC) circuit and an isolated series resonant converter (SRC). The combination of such two circuits creates an isolated AC-DC conver...

Abstract This paper presents an improved finite‐control‐set model predictive control (MPC) strategy for the doubly fed induction generator (DFIG). The MPC‐based controller's main drawback is high computational burden, which requires a long time to perform online optimization. In this regard, real‐time implementation becomes impossible in some cases...

The vulnerability of power systems has increased in recent years due to cyber-physical attacks. Under such conditions, various targets can be exposed to the attacks of non-legitimate agents. This paper considers physical attacks to the distribution network lines and their switches where the attacker aims to maximize the energy not supplied. These a...

Model predictive control has been introduced as a robust and high-performance control method for the permanent-magnet synchronous motor (PMSM) due to its accuracy, simplicity, and flexibility in the controlled variables. In this article, an optimized finite control set-model predictive control method (FCS-MPC) for the surface mounted and interior P...

Multi-carrier energy systems (MESs) provide various types of energy to customers like natural gas, electricity, cool, and heat. The interdependency among natural gas, heating, and power systems is rising due to the extensive growth of electrically powered heating facilities and cogeneration systems. Energy hub (EH) performs as a transitional agent...

Available transfer capability (ATC) plays an essential role in deregulated power network scheduling. This value determines the power that can be transferred between deregulated regions. The ATC value is limited by transmission line constraints and reliability marginal terms. In this article, the impact of dynamic line rating (DLR) instruments, whic...

This paper proposes a robust finite-time controller (FTC) for a permanent magnet synchronous generator (PMSG)-based wind turbine generator (WTG). An adaptive observer is used for the rotor angle, rotor speed, and turbine torque estimations of the PMSG, thus eliminating the use of anemometers. The robustness of the proposed FTC regarding parameter u...

With the growing penetration of distributed energy resources and energy hubs, the transactive energy market appears as a modern power market that facilitates coordinated operation and end‐to‐end energy trading. An energy hub can actively participate in the day‐ahead and real‐time markets for fulfilling various goals. This study proposes an interval...

This paper introduces a transactive market design for a combined heat and power (CHP) based energy hub (hub). The proposed model allows a hub operator to supply the hub’s demands by participating in the day-ahead market and a transactive market with CHPs and also in the real-time market by using a recursive moving window algorithm. The proposed loc...

The Brushless Doubly-Fed Reluctance Machine (BDFRM) has been widely investigated in numerous research studies since it is brushless and cageless and there is no winding on the rotor of this emerging machine. This feature leads to several advantages for this machine in comparison with its induction counterpart, i.e., Brushless Doubly-Fed Induction M...

With the widespread use of information and communication technologies in smart grids, the vulnerability of these networks has increased significantly. In this paper, the operation of a smart electrical energy system is evaluated by considering the information vulnerability of renewable generators and their sensors. Hence, the false data injection p...

Among renewable energy sources, wind energy has attracted much attention as a significant clean energy source all over the world. However, the output power of the wind farms is not consistent and has many fluctuations due to the abrupt variations in wind velocity, which results in system instability. Another important issue in power systems is the...

This paper proposes a new method for direct control of active power and stator flux of permanent magnet synchronous generator (PMSG) used in the wind power generation system. Active power and stator flux are controlled by the proposed discrete time algorithm. Despite the commonly used vector control methods, there is no need for inner current contr...

This paper proposes analytics for reliability assessment of non‐isolated conventional pulse width modulation DC‐DC (NIDC‐DC) converters. This class of converters consists of conventional Buck, Boost, Buck–Boost, Cuk, Sepic and Zeta topologies. The proposed analytics are founded based on the Markov process principles and can effectively capture the...

Due to the voltage level and current of feeders in distribution systems, power loss is high in such networks. With the proliferation of distributed generations, it has become more important to determine their location and rating. These goals can be obtained according to different purposes such as improving the voltage profile. Unlike fixed speed wi...

Introducing the concepts of distributed generation (DG) and microgrid (MG) are known as key points, which lead the conventional distribution systems toward novel smart grids. Utilizing DG infrastructures would facilitate local supply of loads. Hence, it is necessary to optimally distribute DG units all over the distribution network. MGs with abilit...

This article introduces a novel transactive energy management mechanism for future distribution systems with private microgrids. A third-party agent based on a transactive energy trading mechanism is designed which provides secure information sharing between participants. The proposed third-part agent acts as an independent economic entity (IEE) an...

Real-time dynamic line rating forecasting can be classified into two critical steps of evaluating the operation risk and avoiding the overload operation of transmission lines. The dynamic capacity of the transmission line is generally predicted for scheduling power networks in the day-ahead market. However, the forecasting error motivates researche...

Wind farms are increasingly installed in power systems. Such power generation units increase stochastic power system variables, affecting power systems stability. Therefore, the impact of stochastic generation on power systems stability should be carefully taken into account, an aim which can be realized by probabilistic evaluation. This paper pres...

Model predictive control (MPC) based methods are gaining more and more attention in power converters and electrical drives. Nevertheless, high computational burden of MPC is an obstacle for its application, especially when the prediction horizon increases extends. At the same time, increasing the prediction horizon leads to a superior response. In...

The increments of the emission tiers and global warming, as well as the reduction of fossil fuels, have led to a change in the power system of vehicles. Even in maritime transportation, there are more restrictions due to environmental regulations of some ports. In this study, the energy management problem of a marine power system is investigated, s...

Microgrid is a network that usually includes small generators, storages and local loads. Environmental issues, fossil fuels finitude and economic benefits are three important reasons that cause increasing attention to renewable resources and local generation. In recent years, development of renewable resources in electrical networks has been increa...

Dynamic line rating (DLR) technologies are fast becoming a key instrument in power systems with high penetration of wind farms, because power companies can reduce the value of wind power spillage and also can postpone the investments of transmission lines by using DLR equipment. However, what the authors know about DLR is largely based on empirical...

Introducing the concept of distributed generations (DGs) and local demand supply have led to significant changes in distribution networks. The idea of aggregating loads and DGs in an appropriate way have resulted in microgrids' (MGs) appearance. Considering the economic and environmental concerns, MGs will play important roles in future distributio...

This paper investigates the role of modified clustering methods to account correlated uncertainties in the probabilistic power flow problem for alternate current/voltage source control-multiple terminal direct current (ac/VSC-MTdc). Such uncertainties are introduced by stochastic renewable generation units or variable loads. The wind farm is a type...

In this article, a new soft switching isolated push–pull dc–dc converter using a three-winding transformer is proposed. The proposed hybrid resonant and pulse width modulated converter employs a conventional push–pull structure in the primary side, a voltage doubler in the secondary side, and a bidirectional switch besides the transformer, altogeth...

This paper offers a holistic model and approach on reliability assessment of conventional isolated multi-switch pulse width modulation DC-DC (IMSDC-DC) power electronic converters with conventional half-bridge, full-bridge, and push-pull DC-DC topologies. The proposed reliability assessment analytics encapsulate correlated effects of several condit...

Nowadays, the major proportion of fossil fuels is consumed in the transportation systems. Plug-in Electric Vehicles (PEVs) can play a significant role in reducing the petrol consumption. A large amount of additional electrical power demand needed for the charging of PEVs may adversely affect the electric grid reliability. Using charging station in...

Due to the intermittent nature of dynamic rating (DLR) of overhead lines, DLR forecasting plays an important role in the scheduling of power networks. In the DLR forecasting, the trend and fluctuation of past data are modeled and future DLR values are estimated. Autoregressive model and its variants are expanded to reach accurate forecasting. Such...

Abstract - In this study, two sliding mode controllers (SMCs) are proposed for active power control and maximum power point tracking (MPPT) of a doubly fed induction generator (DFIG) in a variable speed wind turbine. The parametric indeterminacy and uncertainty results in inaccurate performance of the DFIG-wind turbine system and may lead to instab...

Energy management in microgrid has been become an important issue in recent studies. Nowadays, energy management strategies are grown rapidly. In this paper, a new energy management strategy has been proposed for a hybrid microgrid including demand response and internal power market. In this regard, multiple markets configuration is considered in t...

This paper proposes a novel scheme for direct power control (DPC) of doubly-fed induction generator (DFIG) in wind power applications. In this scheme, a fuzzy logic controller is used for adjusting the bandwidth of active power hysteresis controller in DPC method in order to reduce the active power ripples and improve dynamic response of the genera...

Abstract: Axial flux permanent magnet machines (AFPMs) have a higher cogging torque than their radial flux counterparts. Power density, cogging torque, torque-speed characteristics, and the efficiency are the most important parameters in the design of the generators. This study aims to investigate the effects of the rotor magnets deviations which r...

Electrical power networks usually consist of multi-area systems, which are connected by tie lines. Dynamic economic/environmental dispatch of multi-area approaches are used to schedule such networks. The goal of multi-area scheduling is determining the optimal operation of generation units and the tie line power flow in a certain period by minimizi...

Recently, much attention has been given to axial flux permanent magnet generators due to some advantages such as high efficiency, high power density, and higher torque compared to radial flux generators. In addition, increased number of poles makes them appropriate for low-speed applications such as wind power generators. In this study, an axial fl...

Model-based predictive control (MPC) is one of the most efficient techniques that is widely used in industrial applications. In such controllers, increasing the prediction horizon results in better selection of the optimal control signal sequence. On the other hand, increasing the prediction horizon increase the computational time of the optimizati...

The sensorless model predictive force control (SMPFC) is a strong method for controlling the drives of three-phase 4(6)-switch inverter linear induction motors. This kind of inverter can be employed for the fault tolerant control in order to solve the problem of open/short circuit in the 6-switch inverters (B6). This paper propose a method for the...

The concept of energy hub as the interface in multi-carrier energy systems has been introduced recently. This concept motivates the researchers to concentrate on multi-carrier energy systems with the purpose of achieving more efficient performance. Multi-carrier energy systems as the upcoming energy providing systems should economically operate in...

Penetration of wind power plants in power systems is increasing, which can influence all over the system stability. In this paper, the impacts of variable speed wind turbines based on permanent magnet synchronous generator on transient stability of power systems are evaluated. An analytical method is investigated, and the rotor angle stability of s...

The volume of data production is increased in smart power system by growing smart meters. Such data is applied for control, operation and protection objectives of power networks. Power companies can attain high indexes of efficiency, reliability and sustainability of the smart grid by appropriate management of such data. Therefore, the smart grids...

In this paper, a resistive-type superconducting fault current limiter (SFCL) besides an efficient control strategy and optimal parameter design approach is suggested to improve low voltage ride-through (LVRT) capability of DFIG wind turbines. The proposed structure is different from conventional hardware-based LVRT solutions from two aspects: the F...

In this paper, a new active method based on traveling wave theory for islanding detection is presented. A standard power grid that combines a distributed generation source and local loads is used to test the proposed method. Simulations are carried out in MATLAB/Simulink and EMTP/rv which demonstrate fast response and zero non-detection zone (NDZ)...

In this paper, a new sensorless model reference adaptive method is used for direct control of active and reactive power of the doubly fed induction generator (DFIG). In order to estimate the rotor speed, a high frequency signal injection scheme is implemented. In this study, to improve the accuracy of speed estimation, two methods are suggested. Fi...

This paper proposes effective approach for determining appropriate crowbar resistance value to be able to improve the brushless doubly fed induction generator ride through capability during any asymmetrical voltage dip scenarios. The brushless DFIG has great potential for wind power plants particularly in offshore applications where maintenance is...

Field-oriented control (FOC) is one of the most effective techniques widely used in industry for speed control of permanent magnet synchronous motor. However, the main drawback of such linear controller with cascade structure is its limited bandwidth to avoid large overshoots and ringing. This problem significantly increases the switching frequency...

In this paper a model fuzzy predictive force control (FPFC) for the speed sensorless control of a single-side linear induction motor (SLIM) is proposed. The main purpose of of predictive control is minimizing the difference between the future output and reference values. This control method has a lower force ripple and a higher convergence speed in...