Developing Decision Tree for Identification of Critical Voltage Control Areas

2011 ◽  
pp. 707-716
Author(s):  
Robert A. Lis
Keyword(s):  
Decision Tree ◽  
Voltage Control ◽  
Critical Voltage

Decision Tree Algorithm for Real-Time Identification of Critical Voltage Control Areas

2014 ◽  
Vol 666 ◽  
pp. 132-137
Author(s):  
Robert Andrzej Lis
Keyword(s):  
Power System ◽  
Decision Trees ◽  
Real Time ◽  
Reactive Power ◽  
Power Grid ◽  
Voltage Control ◽  
Test System ◽  
Critical Voltage ◽  
Transmission Power ◽  
On Line

Voltage stability, is driven by the balance of reactive power in a transmission power grid, and depends on the reactive power produced by the power stations and the value generated by the capacitive power lines and static compensators. Of particular interest is to identify those Critical Voltage Control Areas (CVCAs) in a transmission power grid, that may suffer reactive power deficiencies. Since speed of analysis is critical for on-line applications the approach will address the development of a scheme whereby CVCAs can be identified using data mining techniques from on-line power system snapshot (PMU). The database for storing/retrieving result of Modal Analysis can be used to construct decision trees (DTs) for each of the identified CVCAs using key power system attributes. The objective of this paper is to propose an new real-time methodology for identification of CVCAs, which is key function for preventive and remedial actions against instability of the Electrical Power System (EPS). This is carried out under various system operation and contingency conditions by using off-line trained decision trees generated and on-line PMU measurements. Numerical results on the 12-bus test system, shows the suitability and effectiveness of the proposed method.

Some Applications of the U. S. Steel MVEM

1973 ◽  
Vol 31 ◽  
pp. 4-5
Author(s):  
J. S. Lally ◽  
L. E. Thomas ◽  
R. M. Fisher
Keyword(s):  
Electron Diffraction ◽  
Debye Temperature ◽  
Metals And Alloys ◽  
Critical Voltage ◽  
Dynamical Diffraction ◽  
Phase Structures ◽  
Structure Factors ◽  
Local Bonding ◽  
Diffraction Phenomenon ◽  
Multi Phase

A variety of materials containing many different microstructures have been examined with the USS MVEM. Three topics have been selected to illustrate some of the more recent studies of diffraction phenomena and defect, grain and multi-phase structures of metals and minerals.(1) Critical Voltage Effects in Metals and Alloys - This many-beam dynamical diffraction phenomenon, in which some Bragg resonances vanish at certain accelerating voltages, Vc, depends sensitively on the spacing of diffracting planes, Debye temperature θD and structure factors. Vc values can be measured to ± 0.5% in the HVEM ana used to obtain improved extinction distances and θD values appropriate to electron diffraction, as well as to probe local bonding effects and composition variations in alloys.

718: Modeling the Cost of Management Options for Stage I Nonseminomatous Germ Cell Tumors: A Decision Tree Analysis

2005 ◽  
Vol 173 (4S) ◽  
pp. 195-196
Author(s):  
Richard E. Link ◽  
Mohamad E. Allaf ◽  
Roberto Pili ◽  
Louis R. Kavoussi
Keyword(s):  
Decision Tree ◽  
Germ Cell ◽  
Germ Cell Tumors ◽  
Stage I ◽  
Decision Tree Analysis ◽  
Management Options ◽  
Tree Analysis ◽  
The Cost ◽  
Nonseminomatous Germ Cell Tumors

Automated Development of Clinical Strategies Using Multistage Decision Analysis

1986 ◽  
Vol 25 (04) ◽  
pp. 207-214 ◽  
Author(s):  
P. Glasziou
Keyword(s):  
Decision Tree ◽  
Decision Analysis ◽  
Decision Trees ◽  
Optimal Strategy ◽  
Cholestatic Jaundice ◽  
Clinical Strategies ◽  
Simultaneous Study

SummaryThe development of investigative strategies by decision analysis has been achieved by explicitly drawing the decision tree, either by hand or on computer. This paper discusses the feasibility of automatically generating and analysing decision trees from a description of the investigations and the treatment problem. The investigation of cholestatic jaundice is used to illustrate the technique.Methods to decrease the number of calculations required are presented. It is shown that this method makes practical the simultaneous study of at least half a dozen investigations. However, some new problems arise due to the possible complexity of the resulting optimal strategy. If protocol errors and delays due to testing are considered, simpler strategies become desirable. Generation and assessment of these simpler strategies are discussed with examples.

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