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Operation of long EHVAC cable interconnectors requires controlling voltage/reactive power profiles. With reference to a hypothetical 200 km long 400 kV-50 Hz cable system, connecting to the grid three large OWFs with 2 GW total capacity, the paper compares results yielded by a dedicated algorithm with those of a standard OPF software. A parametric study of the interconnector was carried out, considering...
Fast charging station will play a key role in the widespread diffusion of electric vehicles in large cities. Large public parking areas, such as park-and-ride or commercial centres equipped with fast recharge infrastructure will require dedicated grid connections to the HV transmission grid, due to the significant installed power. The interaction between those multi-MW scale recharge aggregates and...
The undergrounding of HV subtransmission networks in urban/suburban areas is bound to increase fault currents, especially for ground faults if system neutral is solidly grounded. A parametric fault analysis based on symmetrical components is applied to a sample HV system with three lines and two EHV points of supply, based on a simple meshed Italian subtransmission network. Results are then validated...
A double-circuit line using commercially available 400 kV-50 Hz three-core XLPE-insulated submarine cables is considered for the evacuation of up to 1 GW offshore wind generation. Three transmission distances are studied, namely 80 km, 100 km and 160 km, evaluating conventional (line-end) as well as mid-line shunt compensation. Operating envelopes and transmission losses are assessed, showing the...
HVDC technology is a key driver for the integration of renewable energy sources (RES) in large transmission systems. However, the displacement of conventional thermoelectric power plants due to RES development can hinder safe operation of LCC-HVDC converters, especially during inverter operation, mainly due to the reduction of short circuit power on the ac network. These issues are exacerbated in...
The paper deals with the steady-state operation of a radial EHVAC cable transmission system with multiple power injection points, e.g. offshore wind farms, and variable shunt compensation. Generator voltages and variable compensation settings are determined by means of a power flow-based algorithm, aiming at symmetrical current magnitude profiles along individual cable lines (CLs): the proposed operation...
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