Real time estimation of sensitive parameters of composite power system load model

Electric load modeling is of great importance in power system stability analysis and control. Composite load model including induction motor in parallel with static load has been widely accepted as an appropriate structure for describing load behaviors, especially for the studies that deal with power system stability. This paper proposes a nonlinear observer based on Extended Kalman Filter (EKF) to estimate the dominant parameters of the composite load model using real time measurements. The developed estimator can be implemented online and does not require a huge memory for recording load behavior data over a long time. The outcome of this paper makes the online dynamic stability analysis of power systems a step closer to reality. Simulation results are carried out to show the effectiveness of the proposed approach.

[1]  Qian Ai,et al.  New Load Modeling Approaches Based on Field Tests for Fast Transient Stability Calculations , 2006, IEEE Transactions on Power Systems.

[2]  Yung-Tien Chen,et al.  Comparison of simulated power system dynamics applying various load models with actual recorded data , 1994 .

[3]  F. Nozari,et al.  Load modeling for power flow and transient stability computer studies , 1988 .

[4]  Hsiao-Dong Chiang,et al.  Development of a frequency-dependent composite load model using the measurement approach , 1994 .

[5]  Jin Ma,et al.  A Real Application of Measurement-Based Load Modeling in Large-Scale Power Grids and its Validation , 2009, IEEE Transactions on Power Systems.

[6]  C. W. Taylor.  Concepts of undervoltage load shedding for voltage stability , 1992 .

[7]  S. M. Shahidehpour,et al.  Ramp-rate limits in unit commitment and economic dispatch incorporating rotor fatigue effect , 1994 .

[8]  Alberto Borghetti,et al.  On dynamic load models for voltage stability studies , 1997 .

[9]  Jovica V. Milanovic,et al.  Effects of load dynamics on power system damping , 1995 .

[10]  M. Sedighizadeh,et al.  Load Modeling for Power Flow and Transient Stability Computer Studies at BAKHTAR Network , 2007 .

[11]  I.A. Hiskens,et al.  Sensitivity, Approximation, and Uncertainty in Power System Dynamic Simulation , 2006, IEEE Transactions on Power Systems.

[12]  Jürgen Kurths,et al.  Modeling and identification of nonlinear systems , 2004 .

[13]  C. W. Taylor,et al.  Model validation for the August 10, 1996 WSCC system outage , 1999 .

[14]  A. Ellis,et al.  Identifying Load Inventory from Measurments , 2006, 2005/2006 IEEE/PES Transmission and Distribution Conference and Exhibition.

[15]  C. W. Taylor,et al.  Standard load models for power flow and dynamic performance simulation , 1995 .