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The IUP Journal of Electrical and Electronics Engineering:
A Novel Method for Power System Voltage Stability Monitoring Using Artificial Neural Networks with Reduced Input Dimension.
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The paper proposes an Artificial Neural Network (ANN)-based method for monitoring the voltage stability margin in electrical power systems. The reactive power loading margin is used as an indicator of voltage instability. Principal Component Analysis (PCA), an efficient feature selection method, is used to select the minimum number of input variables required to approximate the reactive power loading margin with sufficient accuracy and high execution speed. A comprehensive set of input patterns, covering several loading and contingent conditions that may lead to voltage instability in the system, is generated and used for training the ANN. This ANN-based method is successfully implemented on IEEE 14-bus test system. The results indicate that the proposed PCA method provides an effective and coherent ANN model that can successfully and precisely estimate the reactive power loading margin under different system operating conditions employing the fewest possible input features.

 
 

Voltage stability has become a critical issue for power system transmission and distribution systems due to the continuously increasing demand, high power transfers between interconnected areas and various environmental and economic constraints. Currently, most of the power systems operate very close to their stability limits. The objective behind any power system operation is to supply power to the consumers which is within acceptable voltage and frequency limits. So, the system operators need a fairly accurate knowledge of how far the current operating point is from the voltage stability limit point. Voltage stability analysis is done to determine if a given operating condition is voltage secure or not. It also helps find how far the system can move away from its current operating point and still remain voltage secure (Taylor, 1994).

Heavy reactive power flowing in the transmission lines and inadequate reactive power compensation at the major load buses are the main causes of voltage instability (Crow, 2015). A low reactive power support may leave the system in a vulnerable condition, reducing its capacity to handle loading increments or equipment failures.

 
 
 

Electrical and Electronics Engineering Journal, Reactive power loading margin, Contour, Artificial Neural Network (ANN), Principal Component Analysis (PCA).