Design of an adaptive artificial neural network for online voltage stability assessment

Voltage instability has become a major concern in many power systems and blackouts have been reported, where the reason has been voltage instability. Voltage stability is concerned with the ability of a power system to maintain acceptable voltages at all buses in the system under normal condition and after being subjected to a disturbance. It is an important consideration in the design and operation of power system. Voltage stability is also called the load stability. It is a characteristic of a power system, which is required to transmit sufficient power to meet load demand. The objective of this paper is to present the application of artificial neural network (ANN) in on-line assessment of voltage stability. The proposed method is radial basis function (RBF) neural network. This NN is used for estimation of voltage stability margins (VSM). The IEEE-118 test system is considered for application to this method. A comparison between the proposed NN and a multi-layer perceptron (MLP) with standard error back-propagation learning (EBPL) is presented, which indicates efficiency of this NN. Obtained results confirm the validity of the proposed approach.

[1]  G. J. Berg,et al.  Determination of voltage stability limit in multimachine power systems , 1988 .

[2]  Alberto Berizzi,et al.  First and second order methods for voltage collapse assessment and security enhancement , 1998 .

[3]  Ian Dobson,et al.  Towards a theory of voltage collapse in electric power systems , 1989 .

[4]  T.V. Cutsem,et al.  A method to compute reactive power margins with respect to v , 1991, IEEE Power Engineering Review.

[5]  C. W. Taylor.  Power System Voltage Stability , 1993 .

[6]  Venkataramana Ajjarapu,et al.  The continuation power flow: a tool for steady state voltage stability analysis , 1991 .

[7]  B. Gao,et al.  Voltage Stability Evaluation Using Modal Analysis , 1992, IEEE Power Engineering Review.

[8]  Olav Bjarte Fosso,et al.  A method for calculation of margins to voltage instability applied on the Norwegian system for maintaining required security level , 1993 .

[9]  Thomas J. Overbye,et al.  An energy based security measure for assessing vulnerability to voltage collapse , 1990 .

[10]  P. Kundur,et al.  Towards the development of a systematic approach for voltage stability assessment of large-scale power systems , 1996 .

[11]  Venkataramana Ajjarapu,et al.  Bibliography on voltage stability , 1998 .

[12]  Claudio A. Canizares,et al.  Point of collapse and continuation methods for large AC/DC systems , 1993 .

[13]  Thierry Van Cutsem,et al.  Voltage Stability of Electric Power Systems , 1998 .

[14]  Thomas J. Overbye.  Use of energy methods for on-line assessment of power system voltage security , 1993 .

[15]  F. Alvarado,et al.  Point of collapse methods applied to AC/DC power systems , 1992 .

[16]  P. Kundur,et al.  Power system stability and control , 1994 .