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Dr. Reza Sabzehgar
Electrical and Computer Engineering Department, College of Engineering, San Diego State University, San Diego, CA, USA

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0 Analysis
0 Electric Vehicles
0 Energy Harvesting
0 Modeling
0 Renewable energies

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Journal article
Published: 20 May 2021 in Sustainability
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This work aims to minimize the cost of installing renewable energy resources (photovoltaic systems) as well as energy storage systems (batteries), in addition to the cost of operation over a period of 20 years, which will include the cost of operating the power grid and the charging and discharging of the batteries. To this end, we propose a long-term planning optimization and expansion framework for a smart distribution network. A second order cone programming (SOCP) algorithm is utilized in this work to model the power flow equations. The minimization is computed in accordance to the years (y), seasons (s), days of the week (d), time of the day (t), and different scenarios based on the usage of energy and its production (c). An IEEE 33-bus balanced distribution test bench is utilized to evaluate the performance, effectiveness, and reliability of the proposed optimization and forecasting model. The numerical studies are conducted on two of the highest performing batteries in the current market, i.e., Lithium-ion (Li-ion) and redox flow batteries (RFBs). In addition, the pros and cons of distributed Li-ion batteries are compared with centralized RFBs. The results are presented to showcase the economic profits of utilizing these battery technologies.

ACS Style

Reza Sabzehgar; Diba Amirhosseini; Saeed Manshadi; Poria Fajri. Stochastic Expansion Planning of Various Energy Storage Technologies in Active Power Distribution Networks. Sustainability 2021, 13, 5752 .

AMA Style

Reza Sabzehgar, Diba Amirhosseini, Saeed Manshadi, Poria Fajri. Stochastic Expansion Planning of Various Energy Storage Technologies in Active Power Distribution Networks. Sustainability. 2021; 13 (10):5752.

Chicago/Turabian Style

Reza Sabzehgar; Diba Amirhosseini; Saeed Manshadi; Poria Fajri. 2021. "Stochastic Expansion Planning of Various Energy Storage Technologies in Active Power Distribution Networks." Sustainability 13, no. 10: 5752.

Journal article
Published: 05 March 2021 in Energies
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In this study, a double-loop control strategy is proposed for power grid frequency and voltage regulation using plug-in electric vehicles (PEVs) connected to the grid through a three-level capacitor clamped inverter. The frequency and voltage regulation problem is first formulated using vector space analysis and phasor diagrams to find the boundaries and constraints in terms of the system parameters. The derived formulas are then utilized to design a double-loop controller using an exclusive phase detector control loop and a novel pulse width modulation (PWM) scheme to effectively regulate the frequency and voltage of the grid. The effectiveness and feasibility of the proposed control strategy are evaluated through simulation and experimental studies. This approach can benefit both the customers and the grid operator, as it facilitates utilizing the batteries of the connected PEVs to supply a portion or all of the active and reactive power demand, hence regulating the frequency and voltage of the grid. The extent to which active and reactive power can be supplied depends on the number of PEVs connected to the local grid.

ACS Style

Mohammadshayan Latifi; Reza Sabzehgar; Poria Fajri; Mohammad Rasouli. A Novel Control Strategy for the Frequency and Voltage Regulation of Distribution Grids Using Electric Vehicle Batteries. Energies 2021, 14, 1435 .

AMA Style

Mohammadshayan Latifi, Reza Sabzehgar, Poria Fajri, Mohammad Rasouli. A Novel Control Strategy for the Frequency and Voltage Regulation of Distribution Grids Using Electric Vehicle Batteries. Energies. 2021; 14 (5):1435.

Chicago/Turabian Style

Mohammadshayan Latifi; Reza Sabzehgar; Poria Fajri; Mohammad Rasouli. 2021. "A Novel Control Strategy for the Frequency and Voltage Regulation of Distribution Grids Using Electric Vehicle Batteries." Energies 14, no. 5: 1435.

Journal article
Published: 01 December 2020 in IEEE Transactions on Energy Conversion
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This paper proposes a novel approach to efficiently distribute braking force of an electric vehicle (EV) between friction and regenerative braking with an ultimate goal of maximizing harvested energy during braking. The regenerative braking performance of an EV depends on various factors influenced by the driver behavior and driving conditions, which are challenging to measure or predict in real-time. In the proposed method, the performance map of the traction motor (TM) and its controller is used to define a boundary in which blending of regenerative and friction braking is performed with the goal of maximizing recaptured energy through the regenerative braking process. The proposed method is validated on an experimental EV hardware-in-the-loop (HIL) test bench setup for a predetermined drive cycle of Urban Dynamometer Driving Schedule (UDDS). It is shown that the amount of recaptured energy through the regenerative braking process can significantly increase by taking advantage of the proposed method compared to a case, which considers a constant boundary for brake distribution.

ACS Style

Shoeib Heydari; Poria Fajri; Reza Sabzehgar; Arash Asrari. Optimal Brake Allocation in Electric Vehicles for Maximizing Energy Harvesting During Braking. IEEE Transactions on Energy Conversion 2020, 35, 1806 -1814.

AMA Style

Shoeib Heydari, Poria Fajri, Reza Sabzehgar, Arash Asrari. Optimal Brake Allocation in Electric Vehicles for Maximizing Energy Harvesting During Braking. IEEE Transactions on Energy Conversion. 2020; 35 (4):1806-1814.

Chicago/Turabian Style

Shoeib Heydari; Poria Fajri; Reza Sabzehgar; Arash Asrari. 2020. "Optimal Brake Allocation in Electric Vehicles for Maximizing Energy Harvesting During Braking." IEEE Transactions on Energy Conversion 35, no. 4: 1806-1814.

Journal article
Published: 08 August 2020 in Journal of Building Engineering
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Solar power forecast is a much needed means for grid operators, particularly in residential microgrids, to manage the produced energy in a dispatchable fashion. Deterministic methods are unable to accurately forecast the intermittent solar power generation since they depend on unique sets of inputs and outputs. Therefore, stochastic methods and artificially intelligent (AI) strategies are utilized for solar power forecast. In this work, a neural network (NN)-based numerical weather prediction (NWP) model is developed for a residential microgrid in San Diego, California considering all key weather parameters such as cloud coverage, dew point, solar zenith angle, precipitation, humidity, temperature, and pressure in the year 2016. The developed weather model is then used to predict the generated power in the residential smart microgrid. To validate the accuracy of the model, the solar irradiance and generated solar power in the residential microgrid are predicted for the year 2017 using the obtained NN-based model. The results are compared with the actual solar irradiance and power in 2017 to evaluate and validate the accuracy of the developed model. Furthermore, to showcase the effectiveness of neural networks in forecasting solar power and the accuracy of the NN-based model, the results are compared with those of two other methods including multi-variable regression (MVR) and support vector machine (SVM) approaches using mean absolute percentage error (MAPE) and mean squared error (MSE) criteria.

ACS Style

Reza Sabzehgar; Diba Zia Amirhosseini; Mohammad Rasouli. Solar power forecast for a residential smart microgrid based on numerical weather predictions using artificial intelligence methods. Journal of Building Engineering 2020, 32, 101629 .

AMA Style

Reza Sabzehgar, Diba Zia Amirhosseini, Mohammad Rasouli. Solar power forecast for a residential smart microgrid based on numerical weather predictions using artificial intelligence methods. Journal of Building Engineering. 2020; 32 ():101629.

Chicago/Turabian Style

Reza Sabzehgar; Diba Zia Amirhosseini; Mohammad Rasouli. 2020. "Solar power forecast for a residential smart microgrid based on numerical weather predictions using artificial intelligence methods." Journal of Building Engineering 32, no. : 101629.

Journal article
Published: 20 May 2020 in Energies
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A nonlinear sliding-mode controller for a three-phase converter, utilized in plug-in electric vehicles (PEVs), is proposed in this paper. The proposed controller enables the utilized converter to perform multiple functions during different operating modes of the vehicle, i.e., grid-to-vehicle (G2V) and vehicle-to-grid (V2G) modes. The bidirectional three-phase converter and the proposed controller operate as a power factor correction circuit, bridgeless boost converter, and rectifier during G2V mode (i.e., plug-in charging), and it operates as a conventional single-stage inverter during V2G mode. The stability analysis of the proposed controller is performed by defining a proper Lyapunov function. The functionality of the proposed nonlinear controller is first evaluated through simulation studies. The feasibility and effectiveness of the proposed control strategy is then validated using an industrial control card through a hardware-in-the-loop (HIL) experimental testbed.

ACS Style

Reza Sabzehgar; Yaser M. Roshan; Poria Fajri. Modeling and Control of a Multifunctional Three-Phase Converter for Bidirectional Power Flow in Plug-In Electric Vehicles. Energies 2020, 13, 2591 .

AMA Style

Reza Sabzehgar, Yaser M. Roshan, Poria Fajri. Modeling and Control of a Multifunctional Three-Phase Converter for Bidirectional Power Flow in Plug-In Electric Vehicles. Energies. 2020; 13 (10):2591.

Chicago/Turabian Style

Reza Sabzehgar; Yaser M. Roshan; Poria Fajri. 2020. "Modeling and Control of a Multifunctional Three-Phase Converter for Bidirectional Power Flow in Plug-In Electric Vehicles." Energies 13, no. 10: 2591.

Articles
Published: 06 January 2020 in International Journal of Green Energy
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In this paper, an effective objective function is proposed to minimize the cost of operation of a microgrid with large-scale plug-in electric vehicles and renewable energy resources. The profit of consumers is taken into account by utilizing the incentives in the demand response programs, and vehicle-to-grid feature of the plug-in-electric vehicles integrated into the grid. The optimization is performed using genetic algorithms. Also, reliability indices of the economically optimized microgrid are computed for various operation configurations in both the grid-tied and islanded modes. Numerical studies are conducted on a microgrid testbed to validate the performance of the proposed strategy.

ACS Style

R. Sabzehgar; M. A. Kazemi; M. Rasouli; P. Fajri. Cost optimization and reliability assessment of a microgrid with large-scale plug-in electric vehicles participating in demand response programs. International Journal of Green Energy 2020, 17, 127 -136.

AMA Style

R. Sabzehgar, M. A. Kazemi, M. Rasouli, P. Fajri. Cost optimization and reliability assessment of a microgrid with large-scale plug-in electric vehicles participating in demand response programs. International Journal of Green Energy. 2020; 17 (2):127-136.

Chicago/Turabian Style

R. Sabzehgar; M. A. Kazemi; M. Rasouli; P. Fajri. 2020. "Cost optimization and reliability assessment of a microgrid with large-scale plug-in electric vehicles participating in demand response programs." International Journal of Green Energy 17, no. 2: 127-136.

Research article
Published: 30 January 2019 in IET Power Electronics
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In this study, a novel non-linear sliding-mode controller with a boundary layer solution and a redefined sliding manifold is proposed for a bidirectional converter utilised in plug-in electric vehicles. The proposed method employs a Lyapunov function to formulate the stability condition of the non-linear controller. The proposed switching regime and control strategy enforce a pseudo-resistive relation at the input terminals of the converter to ensure the unity power factor in power conversion. The input resistance of the converter is regulated and controlled to positive and negative values to facilitate both grid-to-vehicle and vehicle-to-grid features, respectively. Simulation and experimental results are provided to evaluate performance of the proposed modelling and feedback control scheme.

ACS Style

Reza Sabzehgar; Yaser M. Roshan; Poria Fajri. Modelling and sliding‐mode control of a single‐phase single‐stage converter with application to plug‐in electric vehicles. IET Power Electronics 2019, 12, 620 -626.

AMA Style

Reza Sabzehgar, Yaser M. Roshan, Poria Fajri. Modelling and sliding‐mode control of a single‐phase single‐stage converter with application to plug‐in electric vehicles. IET Power Electronics. 2019; 12 (3):620-626.

Chicago/Turabian Style

Reza Sabzehgar; Yaser M. Roshan; Poria Fajri. 2019. "Modelling and sliding‐mode control of a single‐phase single‐stage converter with application to plug‐in electric vehicles." IET Power Electronics 12, no. 3: 620-626.

Journal article
Published: 24 January 2019 in IEEE Transactions on Transportation Electrification
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This paper introduces a novel approach for dynamically detecting the lowest speed threshold at which regenerative braking is effective in Electric Vehicles (EVs). The control approach is based on real-time sensing of the motor controller DC link current and disabling regenerative braking when current changes direction while the motor is operating as a generator. Various factors influencing regenerative braking capability of EVs at low speed are discussed and simulation studies are carried out to illustrate the effect of each factor on the displacement of the low-speed threshold. Based on the results obtained from the simulation studies, a dynamic Low-Speed Cutoff Point (LSCP) detection method is proposed. This method requires no hardware modification to the vehicle braking architecture and can be implemented solely by modifying the brake controller. The proposed method is tested on an experimental EV test platform for a predetermined drive cycle. It is shown that in comparison to considering a constant low-speed threshold during braking, the amount of energy recaptured through the regenerative braking process can be improved by taking advantage of the proposed method.

ACS Style

Shoeib Heydari; Poria Fajri; Rasheduzzaman; Reza Sabzehgar. Maximizing Regenerative Braking Energy Recovery of Electric Vehicles Through Dynamic Low-Speed Cutoff Point Detection. IEEE Transactions on Transportation Electrification 2019, 5, 262 -270.

AMA Style

Shoeib Heydari, Poria Fajri, Rasheduzzaman, Reza Sabzehgar. Maximizing Regenerative Braking Energy Recovery of Electric Vehicles Through Dynamic Low-Speed Cutoff Point Detection. IEEE Transactions on Transportation Electrification. 2019; 5 (1):262-270.

Chicago/Turabian Style

Shoeib Heydari; Poria Fajri; Rasheduzzaman; Reza Sabzehgar. 2019. "Maximizing Regenerative Braking Energy Recovery of Electric Vehicles Through Dynamic Low-Speed Cutoff Point Detection." IEEE Transactions on Transportation Electrification 5, no. 1: 262-270.