Abstract
Problem statement: Power- Voltage curve provides very important information for voltage stability analysis. The exact long 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 long 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 characteristic 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 long line model should be considered for voltage stability analysis of the system with the long transmission line.
Highlights
The transmission line is one of the most importantPower system stability is classified as rotor angle stability and voltage stability
Voltage stability is a stability in power systems which are heavily loaded, disturbance or have a insufficiency of reactive power
This study investigated the effects of line loss in long transmission line on voltage stability
Summary
Power system stability is classified as rotor angle stability and voltage stability. Voltage stability is a stability in power systems which are heavily loaded, disturbance or have a insufficiency of reactive power. Most of the fault occurs at the transmission line It is generally divided into three major categories; medium, medium and long model whose distance are about 80 km, above 80-250 and above 250 km, respectively. To fully the generating stations to the major loads points in the overall power system in order to support the high demand of consumers. A utilization the existing system, the exact transmission line should be further investigated. The Power-Voltage (P-V) curve characteristic of power electronics technology, have been proposed for better utilization of the existing transmission systems Igwiro, 2010; Prechanon, 2010; Kumkratug, 2011; Zarate-Minano et al, 2010)
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