Efficient method for alleviating voltage limit violations using local optimisation

Alleviation of voltage limit violation at certain critical buses is a serious problem in the interconnected power system. In this paper, an attempt is made, based on the concept of local optimisation, to alleviate the voltage limit violation by using controls at the local level during any severe disturbance to avoid system collapse. The method is efficient and robust in comparison with existing methods, as the new secure operating point is obtained with minimum control action. The algorithm developed in this paper gives satisfactory results when tested under steady-state conditions on 24 bus IEEE (RTS) and 57 bus IEEE systems under severe and extreme loading conditions