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This paper presents a phase locked loop-based approach for real-time estimation of electro-mechanical modal properties of slow-frequency oscillations in a power grid. The approach utilizes a closed-loop feedback control system to automatically adjust a locally generated signal to optimally fit the targeted signal from real-time measurements in order to obtain modal properties directly from the local...
Analysis of power system dynamics helps to understand the operation of a power system. Therefore, it is significant to design and develop advanced visualization tools to interpret frequency, voltage magnitude, and phase angle information so that it can be presented to the operators in an intuitive manner. On the basis of the measurement data collected by widely-distributed frequency disturbance recorders...
Low frequency oscillations in the power grid can be classified into three types associated with power system events, non-obvious disturbances, and normal power system operations. A statistical analysis is introduced for the three types of oscillations in the Eastern Interconnection (EI) between 2009 and 2010 supported by the North American power Frequency Monitoring Network (FNET). Six “Type III”...
This paper reports results from analysis of low-frequency oscillation monitoring on the Western Interconnection of the North American power system from a distribution-level phasor monitoring network (FNET). Some examples of oscillation characteristics excited by various disturbances are discussed using real measurements taken in 2010. The Matrix Pencil method is used for oscillation modal analysis...
The inter-area oscillations occurring in the Eastern Interconnection (EI) are investigated by six typical cases using the FNET data. The matrix pencil method of multiple signals is used for the modal analysis. The parameters related to mode shape are calculated. The mode shapes for the dominant mode are revealed for each case. Analysis results depict a view of inter-area mode distribution in the Eastern...
The frequency monitoring network (FNET) provides a low-cost, easily deployable method for wide-area monitoring. FNET has the capability to realize long term, high density and continuous monitoring of large interconnected power systems. In effect, there are potentials for ground-breaking research on wide-area monitoring and control. In this paper, low frequency oscillations in the Eastern Interconnection...
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