Research Article Open Access

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

Prechanon Kumkratug1
  • 1 Department of Electrical Engineering, Faculty of Engineering at Si Racha, Kasetsart University, 199 M.6, Tungsukhla, Si Racha, Chonburi, 20230,


Problem statement: Power-Voltage curve provides very important information for voltage stability analysis. The exact medium transmission line model consists of the resistance and the 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 medium line model. Approach: This study applies the concept of the Newton-Raphson method to iteratively solve the nonlinear power flow equations. The Power-Voltage (P-V) curve charateristic of the system without line loss and with line loss are plotted and compared on various cases. Results: It is found from the study that the resistance of the line obviously provides the negative effects on the voltage stability. The line loss causes in the decrement of the critical point. In addition, it is found that the leading power factor can increase the critical point of P-V curve. Conclusion: The exact medium line model should be considered for voltage stability analysis of the system with the medium transmission line.

American Journal of Applied Sciences
Volume 9 No. 6, 2012, 886-889


Submitted On: 28 February 2012 Published On: 19 March 2012

How to Cite: Kumkratug, P. (2012). Power-Voltage Characteristics of Power System with the Medium Transmission Line. American Journal of Applied Sciences, 9(6), 886-889.

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  • Voltage stability
  • voltage collapse
  • critical voltage
  • critical power
  • power-voltage curve
  • newton-raphson
  • reactive power
  • active power