Utility retrofits towers to increase system voltage: union Fenosa uses existing structures for 66-kV to 220-kV transmission line upgrade

摘要

Recently, Spain's Galicia Region has experienced spectacular growth in power-generation capacity, particularly in the sector of wind generation. As a result, consumers in this region are changing their role to power producers and exporters-a situation that has lead to the reversal of power flows in the existing high-voltage (HV) system. This effect is most noticeable in the northwest zone in the Spanish province of La Coruna, where the installation of an additional 244.2 MVA of wind and gas-fired cogeneration projects offering fixed-price energy to the utility has overloaded Union Fenosa's (UF) existing 66-kV distribution system. To provide a HV system able to export the planned two-phase increase in generating capacity, the utility had to redesign and increase the capacity of the existing system to provide an export capability of 631.4 MVA.