304 research outputs found
Estimating Dynamic Load Parameters from Ambient PMU Measurements
In this paper, a novel method to estimate dynamic load parameters via ambient
PMU measurements is proposed. Unlike conventional parameter identification
methods, the proposed algorithm does not require the existence of large
disturbance to power systems, and is able to provide up-to-date dynamic load
parameters consistently and continuously. The accuracy and robustness of the
method are demonstrated through numerical simulations.Comment: The paper has been accepted by IEEE PES general meeting 201
PMU-Based Estimation of Dynamic State Jacobian Matrix
In this paper, a hybrid measurement- and model-based method is proposed which
can estimate the dynamic state Jacobian matrix in near real-time. The proposed
method is computationally efficient and robust to the variation of network
topology. A numerical example is given to show that the proposed method is able
to provide good estimation for the dynamic state Jacobian matrix and is
superior to the model-based method under undetectable network topology change.
The proposed method may also help identify big discrepancy in the assumed
network model.Comment: IEEE International Conference on Circuits and Systems (ISCAS) 201
Data-Driven Diagnostics of Mechanism and Source of Sustained Oscillations
Sustained oscillations observed in power systems can damage equipment,
degrade the power quality and increase the risks of cascading blackouts. There
are several mechanisms that can give rise to oscillations, each requiring
different countermeasure to suppress or eliminate the oscillation. This work
develops mathematical framework for analysis of sustained oscillations and
identifies statistical signatures of each mechanism, based on which a novel
oscillation diagnosis method is developed via real-time processing of phasor
measurement units (PMUs) data. Case studies show that the proposed method can
accurately identify the exact mechanism for sustained oscillation, and
meanwhile provide insightful information to locate the oscillation sources.Comment: The paper has been accepted by IEEE Transactions on Power System
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