The Experts below are selected from a list of 11220 Experts worldwide ranked by ideXlab platform

Babak Fahimi - One of the best experts on this subject based on the ideXlab platform.

  • dynamic behavior of multiport Power Electronic Interface under source load disturbances
    IEEE Transactions on Industrial Electronics, 2013
    Co-Authors: Pourya Shamsi, Babak Fahimi
    Abstract:

    This paper presents the dynamic behavior of multiport Power Electronic Interface (MPEI) under load/source disturbances. A cascaded topology for MPEI is considered. This system is capable of Power management for local generations, loads, and storage systems. Large-signal and small-signal models for MPEI are developed. These models are combined with corresponding control algorithms. Simulated and experimental transient responses to disturbances on each port are presented. The behavior of MPEI in response to each disturbance is analyzed. Simulation and experimental results are compared in order to verify the model.

  • Peak shaving and minimum cost operation of an electric vehicle charging station based on Multi-port Power Electronic Interface
    2012 IEEE Transportation Electrification Conference and Expo (ITEC), 2012
    Co-Authors: Mishel Mahmoodi, Matthew Mcdonough, Pourya Shamsi, Babak Fahimi
    Abstract:

    In this paper, an energy management system for Multi-port Power Electronics Interface (MPEI) is developed to be used in public electric vehicle charging stations. The MPEI has Power Electronic converters to Interface with the utility grid, photovoltaic panels, battery energy storage, and the loads. In order to achieve a minimum daily utility cost, the proposed energy management system provides an economic dispatch of the grid converter considering time-of-use price of electricity and peak shaving functions. Experimental results have been presented to demonstrate the technical capability of the MPEI system and its controllers to operate under various dispatching strategies. A numerical solution of the day-ahead economic dispatch optimization problem is also presented to demonstrate how the dispatching Power commands can be calculated based on a suitable forecasting model of the load and photovoltaic generation.

  • multiport Power Electronic Interface concept modeling and design
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Babak Fahimi
    Abstract:

    The continuous effort to improve efficiency, reduce particle, and greenhouse gase emissions leads to the emergence of the concept “more electric.” This concept helps to boost the performance as well as the flexibility of the domestic and vehicular applications; however, on the other hand, it excessively burdens current Power networks (including vehicle Power systems). In order to remedy this problem, simultaneous usage of renewable sources and energy storages is encouraged. A multiconverter system is commonly adopted to process the renewable Power in form of distributed generation. However, due to the discrete structure of such systems, Power flow and load regulation are coordinated via communication channel, which inevitably reduces the reliability and dynamic response of the system. This paper presents the concept of multiport Power Electronic Interface (MPEI) for renewable energy sources and storages. With a unified modular topology and highly integrated digital control system, controlled quasi-current source is achieved for each input port in both steady-state and transient Power-sharing modes. MPEI analysis, modeling, design, and system operation are treated in a systematic manner in this paper. Both Power stages and digital control system are implemented for a five-port MPEI. Experiments are conducted under meaningful operation scenarios. The results are presented to prove the feasibility of MPEI concept and system design methodology.

  • maximum solar Power transfer in multi port Power Electronic Interface
    Applied Power Electronics Conference, 2010
    Co-Authors: Wei Jiang, Babak Fahimi
    Abstract:

    Ambient energy is a good supplement to existing hybrid Power systems. Among the available options, solar is one of the most readily obtainable and technologically compatible sources. However, uncertainty of sun radiation intensity and changing atmospheric conditions impose challenges in efficient usage of sun Power. Significant progress has been made during the last decades in optimally harvesting solar energy for single input Power system. However, little literature focuses on the control and coordination of solar energy conversion with other actively controlled sources and storages. This paper proposes the operation and control of solar Power conversion in Multiport Power Electronic Interface (MPEI) for different modes of operation: load sharing mode and battery recovery mode. The control structure for solar maximum Power point tracking (MPPT) in load sharing mode is proposed for optimal harvesting from solar panel and to provide immunity to load dynamics. Current-Mode Maximum Power Transfer (CMMPT) method is proposed to transfer maximum Power to battery during charge recovery. The control system is implemented in a TMS320F2812 DSP and experimental results are presented to prove the effectiveness of proposed control system.

  • methods and apparatus for design and control of multi port Power Electronic Interface for renewable energy sources
    2010
    Co-Authors: Babak Fahimi, Wei Jiang
    Abstract:

    Methods and systems for energy management are disclosed. An example system includes a first port connected to an energy storage device for bidirectional flow of energy, a second port connected to an energy source device for unidirectional flow of energy, a third port connected to a utility grid for bidirectional flow of energy, and a unified control system with control logic configured to simultaneously control energy flow between the first, second, and third ports based on at least two factors from the group consisting of: a state of charge of the energy storage device, a state of the energy source device, and a state of the utility grid. Other embodiments are described and claimed.

Alireza Khaligh - One of the best experts on this subject based on the ideXlab platform.

  • bidirectional resonant dc dc step up converters for driving high voltage actuators in mobile microrobots
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Yichao Tang, Alireza Khaligh
    Abstract:

    Electroactive polymer (EAP) actuators have been investigated to convert electrical energy into mechanical deformation in autonomous microrobots. The use of dielectric EAP actuators comes with several challenges to address requirements such as high excitation voltages, explicit driving signals, and low conversion efficiency. External bulky and heavy Power sources are used to generate and provide required excitation voltages. The development of a miniature, high voltage gain, and highly efficient Power Electronic Interface is required to overcome such challenges and enable autonomous operation of miniature robots. In this paper, a bidirectional single-stage resonant dc–dc step-up converter is introduced and developed to efficiently drive high-voltage EAP actuators in mobile microrobots. The converter utilizes resonant capacitors and a coupled inductor as a soft-switched LC network to step up low input voltage. High-frequency soft-switching operation owing to LC resonance allows small footprint of the circuit without suffering from switching losses, which in turn increases the efficiency. The circuit is capable of generating explicit high-voltage actuation signals, with capability of recovering unused energy from EAP actuators. A 4-mm × 8-mm, 100-mg, and 600-mW prototype has been designed and fabricated to drive an in-plane gap-closing electrostatic inchworm motor. Experimental validations have been carried out to verify the circuit's ability to step up voltage from 2 to 100 V and generate two 1-kHz, 100-V driving voltages at 2-nF capacitive loads.

  • digital control of an isolated active hybrid fuel cell li ion battery Power supply
    IEEE Transactions on Vehicular Technology, 2007
    Co-Authors: Alireza Khaligh, A M Rahimi, Ali Emadi, S D Andrews, Cleo Robinson, C Finnerty
    Abstract:

    One of the important issues in modern Electronic equipment is providing higher peak Power while preserving high energy density. Hybrid Power sources composed of fuel cells and batteries combine the high-energy capabilities of fuel cells with the high-Power capabilities of batteries. DC/DC Power converters can appropriately control the Power flow shared between the fuel cell and battery system. In this paper, we propose a new implementation of hybrid fuel cell/battery systems. A 50-W isolated Power Electronic Interface system for a hybrid solid-oxide fuel cell (SOFC)/Li-ion battery portable Power supply is designed and implemented. The control strategy presented in this paper is able to regulate the output current of the fuel cell, the charging current of the battery, and the output voltage of the Power supply. The control strategy is implemented in a DSP and tested by simulation and experiments. Experimental results present the flexibility and generality of the control strategy.

C Finnerty - One of the best experts on this subject based on the ideXlab platform.

  • digital control of an isolated active hybrid fuel cell li ion battery Power supply
    IEEE Transactions on Vehicular Technology, 2007
    Co-Authors: Alireza Khaligh, A M Rahimi, Ali Emadi, S D Andrews, Cleo Robinson, C Finnerty
    Abstract:

    One of the important issues in modern Electronic equipment is providing higher peak Power while preserving high energy density. Hybrid Power sources composed of fuel cells and batteries combine the high-energy capabilities of fuel cells with the high-Power capabilities of batteries. DC/DC Power converters can appropriately control the Power flow shared between the fuel cell and battery system. In this paper, we propose a new implementation of hybrid fuel cell/battery systems. A 50-W isolated Power Electronic Interface system for a hybrid solid-oxide fuel cell (SOFC)/Li-ion battery portable Power supply is designed and implemented. The control strategy presented in this paper is able to regulate the output current of the fuel cell, the charging current of the battery, and the output voltage of the Power supply. The control strategy is implemented in a DSP and tested by simulation and experiments. Experimental results present the flexibility and generality of the control strategy.

Shailendra Jain - One of the best experts on this subject based on the ideXlab platform.

  • modeling of fuel cell based Power supply system for grid Interface
    IEEE Transactions on Industry Applications, 2012
    Co-Authors: Shailendra Jain, Jin Jiang, Xinhong Huang, S. Stevandic
    Abstract:

    Renewable energy systems have developed wide interest to supply electricity in remote areas as well as for distributed Power generation particularly during peak loads. Fuel-cell-based Power generation is also gaining popularity in residential applications as well as distributed Power generation due to its cleanliness, portability, and suitability for electricity and heat generation. Development of a suitable Power Electronic Interface to make the technology viable is still a challenge. This paper presents modeling, simulation, and experimental study of a fuel cell (FC) Power plant (FCPP) suitable for stand-alone application as well as for microgrid/grid Interface. A single-stage pulsewidth modulation inverter is selected as Power Electronic Interface between FC and grid. A mathematical model is developed in per unit system to define the Power limits in terms of FC, converter, and Power system parameters. The simulation model is developed in MATLAB environment with control scheme implementation in qd reference frame for investigation. A prototype of single-stage FCPP is developed in the laboratory to validate the results.

  • a review on fuel cell technologies and Power Electronic Interface
    Renewable & Sustainable Energy Reviews, 2009
    Co-Authors: A Kirubakaran, Shailendra Jain, R K Nema
    Abstract:

    The issue of renewable energy is becoming significant due to increasing Power demand, instability of the rising oil prices and environmental problems. Among the various renewable energy sources, fuel cell is gaining more popularity due to their higher efficiency, cleanliness and cost-effective supply of Power demanded by the consumers. This paper presents a comprehensive review of different fuel cell technologies with their working principle, advantages, disadvantages and suitability of applications for residential/grid-connected system, transportation, industries and commercial applications. Development of mathematical model of fuel cell required for simulation study is discussed. This paper also focuses on the necessity of a suitable Power-conditioning unit required to Interface the fuel cell system with standalone/grid applications.

  • modeling of fuel cell based Power supply system for grid Interface
    Joint International Conference on Power System Technology and IEEE Power India Conference, 2008
    Co-Authors: Shailendra Jain, Jin Jiang, Xinhong Huang, S. Stevandic
    Abstract:

    Renewable energy systems have developed wide interest to supply electricity in remote areas as well as for distributed Power generation specially during peak loads. Fuel cell based Power generation is also gaining popularity due to its cleanliness, portability and suitability for electricity and heat generation. This paper presents modeling of a fuel cell Power plant in terms of fuel cell, converter and Power system parameters, to facilitate operation with grid Interface. The mathematical model is developed in per unit (PU) system using qd0 reference frame theory, to define the Power flow (real and reactive) limits, which can be supplied by the fuel cell Power plant. A single stage PWM inverter is selected as Power Electronic Interface between fuel cell and grid.

Amirnaser Yazdani - One of the best experts on this subject based on the ideXlab platform.

  • sliding mode control of ac voltages and currents of dispatchable distributed energy resources in master slave organized inverter based microgrids
    IEEE Transactions on Smart Grid, 2019
    Co-Authors: Mohammad B. Delghavi, Amirnaser Yazdani
    Abstract:

    This paper proposes a current-controlled voltage-mode control scheme for dispatchable Electronically coupled distributed energy resource (DER) units based on sliding-mode control (SMC) strategy. The proposed control strategy provides fast and stable control on the terminal voltage and frequency of DER unit and ensures protection of the Power-Electronic Interface to external faults. In addition it maintains the quality of the output voltage of the host DER unit in spite of unbalanced and/or distorted load currents. Performance of the proposed SMC strategy is demonstrated through time-domain simulation of a single islanded DER unit, starting from black-start and subjected to various operating scenarios, and it is compared to the performance of a proportional-integral (PI) based control strategy. Also a current-mode control strategy is proposed for DER units based on SMC. The performance of both voltage- and current-mode control strategies are demonstrated in a sample master-slave organized three-unit microgrid.

  • Fractional-Order Sliding-Mode Control of Islanded Distributed Energy Resource Systems
    IEEE Transactions on Sustainable Energy, 2016
    Co-Authors: Mohammad B. Delghavi, Sajjad Shoja-majidabad, Amirnaser Yazdani
    Abstract:

    This paper proposes a voltage control strategy for islanded operation of dispatchable Electronically coupled distributed energy resource (DER) systems, for remote (off grid) electrification systems. The proposed control strategy is based on fractional-order sliding-mode control, offers black-start functionality, maintains the quality of the output voltage of the host DER system in spite of unbalanced and/or distorted load currents, and ensures protection of the Power-Electronic Interface to external faults. Moreover, the fractional derivative order of the controller can be used as an additional tuning parameter. Performance of the proposed control strategy is demonstrated through time-domain simulation of single- and multi-DER islanded networks, starting from black-start and subjected to various operating scenario, and it is also compared to the performance of a proportional-integral (PI)-based control strategy.

  • robust control of an autonomous four wire Electronically coupled distributed generation unit
    IEEE Transactions on Power Delivery, 2011
    Co-Authors: Houshang Karimi, Amirnaser Yazdani, Reza Iravani
    Abstract:

    This paper proposes a control strategy for the autonomous (islanded) operation of a four-wire, Electronically-coupled distributed generation (DG) unit which can feed a highly unbalanced load, e.g., due to the presence of single-phase loads. In the grid-connected mode, the Power-Electronic Interface of the DG unit enables the exchange of real and reactive Power with the distribution network, based on the conventional -frame current control strategy. The current control scheme is disabled subsequent to the detection of an islanding event, and the proposed controller is activated. The proposed control strategy utilizes: i) an internal oscillator to maintain the island frequency and ii) a feedback control system to regulate the island voltage. The proposed control strategy provides a set of balanced three-phase voltages for the load, despite the load imbalance and parameters uncertainties. The proposed control strategy also guarantees robust stability, fast dynamic response to disturbances, and zero steady-state error. A stability analysis is also carried out to determine the robust stability margin of the closed-loop islanded system. Effectiveness of the proposed control strategy is evaluated based on time-domain simulation studies in the PSCAD/EMTDC software environment and verified based on laboratory experiments.