Alberto Berizzi

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   This paper compares two different Optimal Power Flow (OPF) formulations that consider voltage security in power systems. The techniques are both based on multi-objective optimization methodologies, so that operating costs and losses can be minimized while maximizing the " distance " to voltage collapse. The techniques are described in detail and(More)
The penetration of renewable energy sources, particularly wind energy, into power systems has been rapidly increasing in recent years. However, the integration of wind power has posed many challenges for power system operation. For instance, this type of energy source is relatively variable and unpredictable. The installation of this renewable source might(More)
The importance of wind power generation has risen in the last years so much as to be considered among the most important and affordable Renewable Energy Sources (RES) with a growing rate faster than other technologies. Nowadays, wind technology is looking at offshore installations, due to the both lack of land resources and environmentalist opposition. This(More)
– The Hierarchical Voltage Control (HVC) has been adopted in some countries as a significant improvement of the traditional voltage control solutions. This paper deals with the Optimal Reactive Power Flow (ORPF) from a Multi-objective perspective. In particular, it studies the interactions between three objective functions (OFs): one is the " traditional "(More)
The deepening penetration of renewable resources, such as wind and photovoltaic solar, has introduced additional uncertainty into power system operation and control. This added uncertainty, together with the conventional sources of uncertainty, the loads and the availability of resources and transmission assets, makes clear the limitations of the(More)
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