Yazar "Nwankpa C.O." seçeneğine göre listele

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    Impact of demand response on stability region of single-area LFC system with communication delay
    (Institute of Electrical and Electronics Engineers Inc., 2018) Ayasun S.; Nwankpa C.O.
    This paper investigates the impact of dynamic demand response (DR) on the stability region depicted on the controller parameter space of a single-area load frequency control (LFC) system with communication time delays. An effective and simple graphical method is implemented to compute all stabilizing Proportional Integral (PI) controller gains of DR loop for a given time delay. The approach is based on extracting stability region and the stability boundary locus in the PI controller parameter space. © 2017 EMO (Turkish Chamber of Electrical Enginners).
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    Probability of small-signal stability of power systems in the presence of communication delays
    (2009) Ayasun S.; Nwankpa C.O.
    This paper presents a probabilistic approach to evaluate the small-signal stability of power systems in the presence of communication delays. An exact method is first proposed to determine the relationship between delay margin and system parameters such as the system load. The delay margin is then modeled as a random variable and the probability density function (PDF) of the delay margin is determined based on the PDF of the load using a Monte Carlo simulation approach. The communication delays are assumed to be uniformly distributed in a practical range and the probability of system being small-signal stable for a given time delay is determined using the estimated PDF of the delay margin. The proposed method is applied to a single-machine-infinite bus (SMIB) power system with an exciter.
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    Stability of a two-area automatic generation control system with communication delays
    (2009) Ayasun S.; Nwankpa C.O.
    This paper investigates the effect of time delays on the stability of a two-area automatic generation control (AGC) system. The time delays are due to the use of measurement devices and communication links for sending and receiving control signals. The maximum amount of time delay known as the delay margin that the system can tolerate without becoming unstable is determined using Matlab/Simulink. The effect of integral controller gain on delay margin is analyzed.