Power-Voltage Characteristics of Power System with the Short Transmission Line

Problem statement: Power-Voltage curve provides very important information for voltage stability analysis. The exact short transmission line model consists of the resistance and reactance. The resistance causes in the active line loss. It is not easy task to achieve the power-voltage curve characteristics of power system with the exact short line model. Approach: This study applied the concept of the Newton-Raphson method to iteratively solve the nonlinear power flow equations. The power-voltage (P-V) curve characteristic of the system without line loss and with line loss were plotted and compared on various cases. Results: It was found from the study that the resistance of the line obviously provides negative effects on the voltage stability. The line loss causes in the decrement of the critical point. It was found that the leading power factor could increase the critical point of P-V curve. Conclusion: The exact short line model can be considered for voltage stability analysis of the system with the short transmission line.