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This paper first analyzes the model reduction process of linear and nonlinear systems by Krylov subspace methods. Then reduced-order transformation is used to reduce the order of the power system nonlinear dynamic model, which reduces the dimension of the dynamic model and can describe the dynamic process of generator frequency accurately. Finally, IEEE 10-machine 39-bus system is used to verify the...
Wide-area measurement systems have made it possible for operators to monitor the dynamics of the whole power system in real time. By utilizing the FNET/GridEye system in the distribution network, many synchrophasor-based event detectors have been developed. This paper focuses on the development of a real-time application for line trip detection. A frequency-based algorithm is selected to identify...
The Frequency Monitoring Network (FNET) takes GPS-synchronized wide-area measurements in a low-cost, easily deployable manner at the 120V distribution level. It has been monitoring the North American power grid since 2004. Various advanced situational awareness tools have been added using FNET data. Examples include disturbance alert, event location triangulation, oscillation detection, and a number...
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...
The North American Frequency Monitoring Network (FNET) is a wide-area measurement system that monitors the North American Interconnections at distribution voltage level. A situational awareness system has been implemented on the server located at Virginia Tech to detect and analyze power system disturbances in near-real time. This paper demonstrates the viability of monitoring bulk transmission systems...
The North American frequency monitoring network (FNET) takes GPS-synchronized wide-area measurements in a low-cost, easily deployable manner at the 120 V distribution level. A situational awareness system has been implemented on the server located at Virginia Tech to detect and analyze power system disturbances in near-real time. Power system disturbances are examined in this paper based on wide-area...
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...
This paper addresses the on-line estimation of the start of frequency perturbation in power systems using dynamic data measured across distribution networks. These measurements are provided by Internet based real-time, GPS synchronized, wide-area frequency monitoring network (FNET) and PMU data in WECC. In this paper the collected data are evaluated with current statistical model and adaptive tracking...
Wide-area measurement systems (WAMS) enable the monitoring of bulk power systems providing deep insight into system dynamics. The North American frequency monitoring network (FNET) takes GPS-synchronized wide-area measurements in a low-cost, easily deployable manner at the 120 V distribution level. A situational awareness system has been implemented on the server located at Virginia Tech to detect...
With information and measurement technology evolving rapidly within the electric power industry, wide-area measurement, monitoring and control (WAMC) is deemed to be the key technology to improve power system reliability. Guided by this vision, the North American SynchroPhasor Initiative (NASPI) is a nation-wide project that collaborate various resources to build the infrastructure of WAMC across...
This paper reports the initial results on low frequency oscillation monitoring and analysis combining practical measurements from an Internet-based frequency monitoring network (FNET) and simulations. Typical oscillation characteristics excited by various disturbances are shown using simulations and real measurements. The corresponding time-space dynamic propagation patterns are also provided. The...
This paper discusses the latest developments in wide-area frequency-based event location using FNET. FNET, meaning ldquoInternet based frequency monitoring networkrdquo, is a low cost and quickly deployable wide-area frequency measurement system with high dynamic accuracy. This project demonstrated the feasibility of using information from FNET to estimate the location of events in the electric grid...
Disturbance location information in power system is critical information to power system operator. Fast and accurate event location estimation may help operators respond promptly to restore the system to a normal operating condition. With the help of the Internet based real-time, GPS synchronized, wide-area frequency monitoring network (FNET) , Virginia Tech has patented and implemented the event...
It is very important to understand system dynamics during disturbances in order to improve control measures to ensure power system security and reliability. Power system disturbances are examined in this paper based on wide-area frequency data from a nation-wide frequency monitoring network (FNET). Frequency characteristics of events in three major North America power grids are investigated. Typical...
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