Renewable Source Power Quality in Italian Grid by Paduan Three-Phase Power Flow PFPD-3P

In this paper, the matrix algorithm PFPD-3P is extended to consider the presence of inverter based renewable energy sources in the three-phase power flow solution of real transmission networks. In particular, it is demonstrated that the inverter based renewable energy sources can be seen as PV/PQ constraints from the AC power systems. Since three-phase power flow is fundamental to compute the supply power quality, inverter sequence component behavior is considered. Then, the method is tested on the Italian transmission grid, and the voltage unbalance factors are computed for different scenarios. In the first scenario, the electric energy is produced by the current generation mix. In the second scenario, the active power generated by inverter based renewable energy sources is strongly increased. Nowadays, these electric power sources represent the majority of the new installations, in order to respect energy transition goals. Then, some scenarios investigate different mitigation technologies, in order to reduce unbalance factors of the Italian EHV/HV network.