The Experts below are selected from a list of 126 Experts worldwide ranked by ideXlab platform

Lingling Fan - One of the best experts on this subject based on the ideXlab platform.

  • 1Determine Power Transfer Limits of An SMIB System through Linear System Analysis with NonLinear Simulation Validation
    2016
    Co-Authors: Student Member, Lingling Fan, Senior Member
    Abstract:

    Abstract—This paper extends the materials presented in Chap-ter 7 of a classic textbook “Power System Analysis ” [1] used in EEL 6936 Power Systems II at University of South Florida. This research examines the effect of automatic voltage regulator (AVR) and the power System stabilizer (PSS) on the power transfer level. The System analyzed in this paper includes a synchronous generator connected to an infinite bus. Their effect on stability is investigated through plotting eigenvalues of closed-loop transfer functions along with Routh-Hurwitz stability criterion examina-tion. Three different models are considered. The basic model includes a swing equation with one order rotor flux dynamics. This model is classified as an electromagnetic model (EMT). Then, the voltage control part is added (EMT+AVR). Finally, the power System stabilizer is added to the System (EMT+AVR+PSS). These models are Linearized for Analysis. NonLinear simulation results based on the nonLinear models built in Matlab/Simulink validate the Analysis results. Index Terms—Infinite bus, Linear Analysis, non-Linear simula-tion, power level, AVR, PSS

  • determine power transfer limits of an smib System through Linear System Analysis with nonLinear simulation validation
    North American Power Symposium, 2015
    Co-Authors: Lingling Fan
    Abstract:

    This paper extends the materials presented in Chapter 7 of a classic textbook “Power System Analysis” [1] used in EEL 6936 Power Systems II at University of South Florida. This research examines the effect of automatic voltage regulator (AVR) and the power System stabilizer (PSS) on the power transfer level. The System analyzed in this paper includes a synchronous generator connected to an infinite bus. Their effect on stability is investigated through plotting eigenvalues of closed-loop transfer functions along with Routh-Hurwitz stability criterion examination. Three different models are considered. The basic model includes a swing equation with one order rotor flux dynamics. This model is classified as an electromagnetic model (EMT). Then, the voltage control part is added (EMT+AVR). Finally, the power System stabilizer is added to the System (EMT+AVR+PSS). These models are Linearized for Analysis. NonLinear simulation results based on the nonLinear models built in Matlab/Simulink validate the Analysis results.

  • on active reactive power modulation of dfig based wind generation for interarea oscillation damping
    IEEE Transactions on Energy Conversion, 2011
    Co-Authors: Lingling Fan, Haiping Yin, Zhixin Miao
    Abstract:

    In this paper, the interactions of the torsional dynamics of the wind turbines and power modulation for oscillations in DFIG-based wind generators are investigated. One major concern of active power modulation is its interaction with wind turbine's torsional dynamics. A study case with wind turbine torsional dynamics modeled is derived from our earlier work. Both active power modulation and reactive power modulation controls are developed in this paper. The paper successfully demonstrates the presence of interaction between active power modulation and torsional dynamics and the absence of such interaction in the case of reactive power modulation. Linear System Analysis and root loci approach are employed to demonstrate such interaction. Simulation results in MATLAB/Simulink further verifies the Analysis. The major contribution of this paper is: 1) the demonstration of the potential disadvantage of wind generation's active power modulation; and 2) the identification of reactive power modulation in wind generation as an alternative for interarea oscillation damping.

  • A comparison of slip control, FMA control and vector control in DFIG converter
    2008 34th Annual Conference of IEEE Industrial Electronics, 2008
    Co-Authors: Lingling Fan, Zhixin Miao, Subbaraya Yuvarajan, J. Glower
    Abstract:

    This paper developed three control schemes to coordinate maximum power extraction and voltage control for doubly fed induction generators wind turbines during wind fluctuation. Via PWM, the rotor-side converter can generate a controllable AC voltage with controllable magnitude and frequency. Based on PWM, control schemes: slip control, flux magnitude and angle (FMA) control and vector control are developed. Wind turbine aerodynamics are modeled in dynamic simulation and to obtain a lookup table for torque/power control. In slip control, the voltage is coordinated with torque via voltage/Hz type control. In FMA control, the inner feedback loops of rotor flux magnitude and angle are developed. Torque control loop is added outside the flux angle control loop while voltage control loop is added outside of the flux magnitude control loop. In vector control, the power control loop and voltage control loop are added as the outside control loops while the current control loops is designated as the inner control loops. The purpose of the voltage control is to keep a constant stator voltage, and the power/torque control is used to get maximum wind power under varying wind speeds. Dynamic performance and robustness of the three control schemes are analyzed via Linear System Analysis tools (Bode plots). Matlab-based time-domain simulations are performed to verify the Analysis results and the proposed control schemes.

Kai Sundmacher - One of the best experts on this subject based on the ideXlab platform.

  • studying mass transport dynamics in polymer electrolyte membrane fuel cells using concentration alternating frequency response Analysis
    Journal of Power Sources, 2019
    Co-Authors: Antonio Sorrentino, Kai Sundmacher, Tanja Vidakovickoch
    Abstract:

    Abstract In the present contribution an experimental validation and a measurement routine of a new electrochemical method to study dynamics of electrochemical processes, the so-called concentration alternating frequency response Analysis (cFRA) is presented. In cFRA the electrical response of the cell (current or potential) to periodic perturbation of specific reactant feeds is studied by means of Linear System Analysis. For the example of a polymer electrolyte fuel cell (PEMFC) we show that cFRA, in contrast to classical electrochemical impedance spectroscopy (EIS), detects selectively the effect of the dynamics of mass transport of reactants and products inside the different layers of the PEMFC. Moreover, cFRA can be used to diagnose the humidification state of the fuel cell cathode. Finally, procedures to improve the diagnostic skills of the proposed cFRA technique are discussed and directions of future work are recommended.

  • transfer function Analysis of the dynamic behaviour of dmfcs response to step changes in cell current
    Journal of Power Sources, 2006
    Co-Authors: Ulrike Krewer, Kai Sundmacher
    Abstract:

    This paper presents investigations on the dynamic behaviour of DMFCs. Experimental cell voltage responses to cell current step changes are investigated with transfer function Analysis. The voltage response in most places shows significant overshooting behaviour (up to 80%) when applying cell current steps to the DMFC. Linear System Analysis is applied to a set of dynamic models with different complexity, and a criterion for cell voltage overshooting is developed. In all models the dominating physico-chemical phenomenon is the transport of methanol through the membrane, causing cathodic overpotential overshooting. This is supported by experimental Analysis. The proposed models and transfer functions are suitable for controller design.

Charles S. Lessard - One of the best experts on this subject based on the ideXlab platform.

  • NonLinear Analysis Of Human Optokinetic Responses
    [1990] Proceedings of the Twelfth Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1
    Co-Authors: C. Wong, Charles S. Lessard
    Abstract:

    The vestibulo-ocular System has been shown to be a nonLinear System, however, classic Linear System Analysis method is being used to analyze the results in most vestibular investigations. A sum-of-sinusoids method, capable of revealing Linearity as well as nonLinearity, is used to study the optokinetic responses of human subjects. NonLinearity of the ocular System is detected by the occurrence of interaction frequencies in the power spectrum of the processed optokinetic response.

Jeanjacques E Slotine - One of the best experts on this subject based on the ideXlab platform.

  • on contraction Analysis for non Linear Systems
    Automatica, 1998
    Co-Authors: Winfried Lohmiller, Jeanjacques E Slotine
    Abstract:

    This paper derives new results in non-Linear System Analysis using methods inspired from fluid mechanics and differential geometry. Based on a differential Analysis of convergence, these results may be viewed as generalizing the classical Krasovskii theorem, and, more loosely, Linear eigenvalue Analysis. A central feature is that convergence and limit behavior are in a sense treated separately, leading to significant conceptual simplifications. The approach is illustrated by controller and observer designs for simple physical examples.

Chen Liang-gang - One of the best experts on this subject based on the ideXlab platform.

  • Min-projection-strategy switching rules for DC-DC converters modeled as piecewise Linear Systems
    Control theory & applications, 2009
    Co-Authors: Chen Liang-gang
    Abstract:

    Stability and control of DC-DC converters are handled easily and efficiently by utilizing piecewise Linear System Analysis approach.Applying the stability theorem of piecewise Linear Systems,we establish the min-projection-strategy switching rules for realizing the global stability of the System.The method for analyzing the convergence-rate based on the min-projection strategy is then proposed.This Analysis reveals the nature of the convergence-rate of piecewise Linear Systems in the entire state-range,and supplies theoretical basis for improving the convergence-rate of the min-projection-strategy switching rules.Finally,the Boost DC-DC converter is selected as an example for verifying the above theory. Experimental results from this DC-DC converter demonstrate the feasibility of the min-projection-strategy switching rules.