Identification of the dynamic equivalent of a power system

This paper presents the identification of the dynamic equivalent of a power system from on-line measurements by using knowledge of coherent generators to determine the model structure. The knowledge of coherent generators is a crucial part of power system model reduction that could indicate how many equivalent generators should there be and how they are interconnected. By using the interpretation of coherency from the graph model of a power system, the coherent generators can be identified without the necessity of dynamic parameters. Test results of a small five bus system are presented and the feasibility of the proposed method is demonstrated. It is shown that the obtained dynamic equivalent is more reliable when the model structure is used.

[1]  Andrija T. Saric,et al.  Identification of nonparametric dynamic power system equivalents with artificial neural networks , 2003 .

[2]  J. M. Undrill,et al.  Construction of Power System lectromechanical Equivalents by Modal Analysis , 1971 .

[3]  Joe H. Chow,et al.  Time-Scale Modeling of Dynamic Networks with Applications to Power Systems , 1983 .

[4]  J. M. Ramirez Arredondo,et al.  Obtaining dynamic equivalents through the minimization of a line flows function , 1999 .

[5]  Luis Rouco,et al.  Synchronic modal equivalencing (SME) for structure-preserving dynamic equivalents , 1996 .

[6]  D.N. Ewart,et al.  Dynamic equivalents from on-line measurements , 1975, IEEE Transactions on Power Apparatus and Systems.

[7]  R. Podmore.  A Comprehensive Program For Computing Coherency-based Dynamic Equivalents , 1979 .

[8]  Babak Ayazifar,et al.  Graph spectra and modal dynamics of oscillatory networks , 2002 .

[9]  Fred C. Schweppe,et al.  Maximum likelihood identification of power system dynamic equivalents , 1974, CDC 1974.

[10]  A.H. El-Abiad,et al.  Dynamic equivalents using operating data and stochastic modeling , 1976, IEEE Transactions on Power Apparatus and Systems.

[11]  Petar V. Kokotovic,et al.  Time scale modeling of dynamic networks with sparse and weak connections , 1987 .

[12]  Ping Ju,et al.  Dynamic equivalents of power systems with online measurements. Part 2: applications , 2004 .

[13]  Yao-nan Yu,et al.  Estimation of External Dynamic Equivalents of a Thirteen-Machine System , 1981, IEEE Transactions on Power Apparatus and Systems.