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This paper presents a new hybrid particle swarm
optimization (HPSO) method for solving multiobjective real
power optimization problem. The objectives of the
optimization problem are to minimize the losses and to
maximize the voltage stability margin. The proposed method
expands the original GA and PSO to tackle the mixed –integer
non linear optimization problem and achieves the voltage
stability enhancement with continuous and discrete control
variables such as generator terminal voltages, tap position of
transformers and reactive power sources. A comparison is made
with conventional, GA and PSO methods for the real power
losses and this method is found to be effective than other
methods. It is evaluated on the IEEE 30 and 57 bus test system,
and the simulation results show the effectiveness of this
approach for improving voltage stability of the system.
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