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This paper deals with a new dispatching and optimisation of reactive power sources in power systems. The methodology is first based on an optimal movement of existing reactive sources as a first phase, then an optimal investment in a second phase and finally a combination of the two previous phases as the third one [1]. The methodology showed also the advantage of a two levels procedure, considering an initial minimal compensation before minimizing the active losses. The solution of the global non-linear problem is performed using the projected and augmented Lagrange method associated with the reduced gradient and the DFP methods. Simulations are executed on the 57 IEEE Network that results are presented and discussed.