scholarly journals Time-Dependent Statistical Analysis of Wide-Area Time-Synchronized Data

2010 ◽  
Vol 2010 ◽  
pp. 1-17 ◽  
Author(s):  
A. R. Messina ◽  
P. Esquivel ◽  
F. Lezama
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Temporal Dynamics ◽  
Practical Importance ◽  
Nonstationary Process ◽  
Difficult Problem ◽  
Area Measurement ◽  
Wide Area ◽  
Time Frequency

Characterization of spatial and temporal changes in the dynamic patterns of a nonstationary process is a problem of great theoretical and practical importance. On-line monitoring of large-scale power systems by means of time-synchronized Phasor Measurement Units (PMUs) provides the opportunity to analyze and characterize inter-system oscillations. Wide-area measurement sets, however, are often relatively large, and may contain phenomena with differing temporal scales. Extracting from these measurements the relevant dynamics is a difficult problem. As the number of observations of real events continues to increase, statistical techniques are needed to help identify relevant temporal dynamics from noise or random effects in measured data. In this paper, a statistically based, data-driven framework that integrates the use of wavelet-based EOF analysis and a sliding window-based method is proposed to identify and extract, in near-real-time, dynamically independent spatiotemporal patterns from time synchronized data. The method deals with the information in space and time simultaneously, and allows direct tracking and characterization of the nonstationary time-frequency dynamics of oscillatory processes. The efficiency and accuracy of the developed procedures for extracting localized information of power system behavior from time-synchronized phasor measurements of a real event in Mexico is assessed.

scholarly journals Wide Area Measurement Technology in Power Systems

2016 ◽  
Vol 25 ◽  
pp. 718-725 ◽  
Author(s):  
R.B. Sharma ◽  
G.M. Dhole
Keyword(s):  
Power Systems ◽  
Area Measurement ◽  
Wide Area ◽  
Measurement Technology

scholarly journals Conformance Testing and Analysis of Synchrophasor Communication Message Structures and Formats for Wide Area Measurement Systems in Smart Grids

2017 ◽  
Vol 6 (2) ◽  
pp. 106
Author(s):  
Adeyemi Charles Adewole ◽  
Raynitchka Tzoneva
Keyword(s):  
Power Systems ◽  
Power System ◽  
Communication Networks ◽  
Smart Grids ◽  
Data Communication ◽  
System Stability ◽  
Area Measurement ◽  
Wide Area ◽  
Protection And Control ◽  
And Control

The renewed quest for situational awareness in power systems has brought about the use of digital signal processing of power system measurements, and the transmission of such data to control centres via communication networks. At the control centres, power system stability algorithms are executed to provide monitoring, protection, and control in order to prevent blackouts. This can be achieved by upgrading the existing Supervisory Control and Data Acquisition (SCADA) systems through the deployment of newly proposed power system synchrophasor-based applications for Wide Area Monitoring, Protection, and Control (WAMPAC). However, this can only be done when there is a complete understanding of the methods and technologies associated with the communication network, message structure, and formats required. This paper presents an analysis of the IEEE C37.118 synchrophasor message framework, message formats, and data communication of synchrophasor measurements from Phasor Measurement Units (PMUs) for WAMPAC schemes in smart grids. A newly designed lab-scale testbed is implemented and used in the practical experimentation relating to this paper. Synchrophasor measurements from the PMUs are captured using a network protocol analyzer software-Wireshark, and the compliance of the synchrophasor message structures and formats captured was compared to the specifications defined in the IEEE C37.118 synchrophasor standard.

scholarly journals Dynamic Model Reduction for Large-Scale Power Systems Using Wide-Area Measurements

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 97863-97872
Author(s):  
Ning Tong ◽  
Zhihao Jiang ◽  
Lin Zhu ◽  
Yilu Liu
Keyword(s):  
Power Systems ◽  
Model Reduction ◽  
Dynamic Model ◽  
Large Scale ◽  
Wide Area

scholarly journals Time-Frequency Characterization of Rotating Instabilities in a Centrifugal Pump with a Vaned Diffuser

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
G. Pavesi ◽  
G. Cavazzini ◽  
G. Ardizzon
Keyword(s):  
Large Scale ◽  
Pressure Fluctuations ◽  
Computer Code ◽  
Design Flow ◽  
Vaned Diffuser ◽  
Time Frequency ◽  
Ansys Cfx ◽  
Frequency Domains ◽  
Radial Pump

This paper presents acoustic and flowdynamic investigations of large-scale instabilities in a radial pump with a vaned diffuser. Pressure fluctuations were measured with transducers placed flush at the inlet duct, at the impeller discharge, and in the vane diffuser walls. Two impeller rotation speeds were analyzed in the study, at design, and at off-design flow rates. A spectral analysis was carried out on the pressure signals in frequency and in time-frequency domains to identified precursors, inception, and evolution of the pressure instabilities. The results highlighted the existence of a rotating pressure structure at the impeller discharge, having a fluid-dynamical origin and propagating both in the radial direction and inside the impeller. The experimental data were then compared with the results obtained with help of ANSYS CFX computer code; focusing on the changing flow field at part load. Turbulence was reproduced by DES model.

Improvement of transient stability for power systems using wide-area measurement signals

2009 ◽  
Vol 91 (3) ◽  
pp. 133-143 ◽  
Author(s):  
Chun-xia Dou ◽  
Shi-liang Guo ◽  
Xing-zhong Zhang
Keyword(s):  
Power Systems ◽  
Transient Stability ◽  
Area Measurement ◽  
Wide Area
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