Development of Voltage Stability Analysis Tools in Matlab/Simulink Environment

This research intends to create an environment in which the voltage stability can be analyzed by plotting P-V curve. In the advancement and development in the power system analysis, a tool on Matlab/Simulink has been developed. It can look how stable the system can operate based on the voltage surface when the load increases at any node. By repeating the power flow calculations with Newton- Raphson method when the load increases, the upper level voltage of P-V curve can be calculated. However, using usual initial power flow calculation cannot compute both upper and lower level voltages of P-V curve; therefore special methods must be used. In this research, upper and lower level voltages of P-V curve can be calculated by initial power flow calculation where the load is represented as a constant impedance load. The developed environment is compared with a general power system analysis tool. In addition, the developed environment can be applied in designing FACTS devices. Results demonstrate the effectiveness of the proposed methodology.