The Effects of Harmonics on Voltage Stability

Abstract

Demand for electrical energy has been increasing by the time as related to both technological developments and increase in population. It is necessary to enhance the quality of the electrical energy, especially supplied one. With considering voltage stability of power system, which includes nonlinear loads, during the planning, operating, and controlling of electrical power systems, more reliable and high quality energy is supplied. In this study, the effects of harmonic components on voltage stability, caused by nonlinear elements, have been demonstrated by a synthesis of harmonic power flow analysis and voltage stability one based on Newton-Raphson method. Harmonic modeling for power system and the models obtained from mathematical equations belonging to the steady-state voltage stability have been used together to realize this synthesis. Accordingly, the effects of non-sinusoidal quantities on the voltage stability, neglected so far, are considered and then the analysis is performed under this condition. Thus, the more realistic results were obtained by the harmonic power flow based upon the voltage stability analysis.