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The increase in the amount of generators based on renewable energy sources (RES) in the power system is leading to many changes in its operation. Since the RES depends on weather conditions, coordinating the operation of the entire power system has become a more complex issue. New challenges need to be faced in order to supply the electric energy to the customers at the appropriate quality level. In this paper the concept and architecture of a complex Virtual Power Plant (VPP) will be introduced and discussed. The focus will be paid to the optimization of the structure of the VPP as well as to its optimal operation. The result of the optimization have been presented and discussed in the paper taking into account different operation scenarios.Index Terms -Virtual Power Plant, power flow monitoring and control, renewable energy sources, synchronized measurements, system observability.

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The Russian power system is diversified regionally and consists of one Unified Power System (UPS) and multiple isolated power systems. In the Russian Federation the policy on the use of renewable energies has been one of the most debated topics in recent years. In 2010, the Russian Renewable Energy Program was launched which aims to generate 4.5% of the entire electricity demand from renewable energy sources by 2020. These energy resources can significantly contribute to both the reduction of electricity generation costs in the Isolated Power Systems (IPS) and to the creation of new job opportunities. In this study an innovative methodology for the planning of isolated power systems is presented. The methodology is based on the Analytic Hierarchy Process (AHP) and on the software program HOMER Energy (R). It considers the economic, social and environmental criteria for the optimal planning of isolated systems. A case study related to a small Siberian isolated power system is analyzed