Power Quality Assessment in Liberalized Market: Probabilistic System Indices for Distribution Networks with Embedded Generation

The paper deals with the problem of assessing the impact on the service power quality (PQ) of new installations of embedded generation. To face with this problem, two types of indices are proposed: variation and benefit index. Their definition is irrespective to the specific disturbance to be considered so that it is possible to indicate them as generalised indices to properly and quickly quantity the influence of different EG solutions on the PQ disturbance levels. Numerical applications on an actual distribution system give evidence of the useful indications that can be derived