New 5-Phases Solution and Series Compensation for OHLs Power Transfer Capacity and Static Stability Increase

Modern power systems have to face multiple concerns in the light of the decarbonization process. In the Italian context, increasing network congestions are expected in future energy scenarios due to the huge growth of renewable generation capacity foreseen across long corridors from the South, where primary sources are concentrated, to the North, where main load areas are located. The extension of strategic transmission paths operational limits is therefore a crucial topic. In this paper, the innovative Extra High Voltage (EHV) “5-phases” solution combined with the capacitive series compensation is studied in a test grid portion affected by critical power transfers. The great longitudinal reactance reduction of selected network branches leads to relevant benefits in terms of loadability increase and voltage phase shifts mitigation.