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The weakly damped low frequency oscillation deteriorates the stability of some interconnected power systems. In order to suppress the swings more efficiently, the global dynamics of different areas are required, and then the synchrophasor measurement techniques are becoming necessary for real time and continuous control. In this paper, the design, implementation and commission of a coordinated wide-area...
With increasing use of phasor measurement units in power system, an enormous amount of data is being stored in phasor data concentrators (PDCs). PDCs have the capability to store disturbance files separately. Over a period of time, the number of such disturbance files keeps increasing. However, these files are not really mined for data and mapped to actual events that may have caused the disturbance...
This paper addresses the importance of Optimal placement of Phasor Measurement Units (PMUs) for complete system observability. PMUs are costly to install at every substation, therefore algorithms are developed to minimize the total required amount of PMUs for observability of the system at hand. The Matrix Manipulation Algorithm was developed for this purpose, yet proved to work well for small systems...
Synchrophasor systems are being added to modern power systems to facilitate improved wide area monitoring and wide area protection schemes. As synchrophasor systems are installed utilities must decide if new cyber devices, phasor measurement units and phasor data concentrators, will be declared as The US National Electric Reliability Council (NERC) Critical Infrastructure Protection (CIP) cyber critical...
The continuous development of electric power systems characterized by an increasing potential of decentralized energy generation requires high precision measurement technologies for an effective and reliable network monitoring and system state assessment to ensure the high level of present and future security of energy supply. One possibility to capture system parameters, which has been established...
The optimal PMU locations to collect voltage phase angle measurements for detecting line outages in wide-area transmission networks are investigated. The problem is established as one of maximizing the minimum distance among the voltage phase angle signatures of the outages, which can be equivalently formulated as an integer programming problem. Based on a greedy heuristic and a linear programming...
This paper presents a Multi-Area State Estimation strategy suited to interconnected networks that incorporates the traditional external equivalent technique into the model. Given the relevance of external and boundary systems modeled to wide area state estimation precision, this paper demonstrates the potential of synchrophasors to provide more precise external modeling and yield better internal and...
To reduce emission of carbon dioxide the proportion of renewable energies is rapidly growing in German and European grids in general. Additionally, the bulk of them are generated in only a few spots in European transmission grid, whereas conventional power plants will shut down and the load center distribution will still be decentralized. This results in the need of a new and powerful transmission...
This paper presents a pre-procedure to detect and identify gross errors including topology errors for state estimation in smart grid. This pre-procedure is characterized to be fast The key idea behind the procedure is the concept of a solving path, which avoids the chance of divergence when calculating system states using all the measurments in traditional state estimation algorithms. An integer linear...
This paper proposes a synchrophasor-based approach for prediction of inter-area angular instability in interconnected power systems and decision support on mitigation actions. The approach is performed in two stages: 1) offline identifying clusters of generators to be monitored by synchrophasors and developing a mitigation-strategy table for potential out-of-step scenarios; 2) online monitoring dynamic...
Model reduction techniques are often applied to large-scale complex power systems to increase simulation performance. The bottleneck of existing methods to get a high reduction ratio lies in: (1) Coherency identification is static and conservative. Some coherent generators are not detected when system topology or operating point changes. (2) Solitary generators outside any coherency group are not...
OpenPMU, the Open Source Phasor Measurement Unit, is a platform for the development of Synchrophasor measurement technology in an open source manner. The OpenPMU design modularizes the key components of a Phasor Measurement Unit (PMU) into three subsystems; measurement, phase estimation and telecoms. The advantage to the researcher is that the interfaces between each subsystem are open and human readable,...
Wide area protection based on phasor measurements have become more and more important research issue. A method is proposed for fast and accurate real time detection of transient instability based on the wide area measurements. Trajectory characteristic and transient energy are synthesized to improve the detection accuracy for complex power system. The relationship between trajectory characteristic...
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