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Abstract
Voltage instability problem arises due to the ever increasing load demand which pushing the networks to their stability boundaries and increases the risk of partial blackouts. Therefore, there is a need to assess the voltage stability of the system in order to know of how close the operating point is from the voltage stability limit. When the system is close to voltage instability, actions are required to relieve the situation and mitigate the problem. Distributed generation (DG) and capacitor placement are introduced as vital solutions to maintain the voltage stability in the distribution networks. The main core of this thesis to obtain the optimal allocation of DG and capacitor which enhance the voltage stability of the network also to capture the real performance of loads in the network the realistic behavior of load demand and how the optimal allocation of DG is affected by that behavior has also investigated