Generalized Power Grid Reduction Technique

Abstract

This work presents a power grid reduction method that allows the accomplishment of several study cases with different loading conditions regarding the same system by performing a single reduction process. In particular, this technique presents robustness for radial and meshed power grid topology and unbalanced systems modeled with neutral wire, which are not available in related existing publications. Equally important, the evaluation metric employs the phasors voltages instead of just the magnitude itself, as normally seen in the literature. In this fashion, the proposed technique shows the capability to remove more than 2000 buses from a benchmark EPRI feeder with phasorial voltage accuracy of 99% and to speed up 67% its power flow simulation time. Moreover, this paper also exposes a meshed grid reconfiguration and an evaluation of losses from the reduced IEEE 123 buses feeder with photovoltaic distributed generation through a QSTS simulation with a maximum of 1.8% relative losses errors.