70
Annex A
Case studies MVDC economics
This annex provides numerical analysis of
the economics MVDC cable deployment
versus cable deployment. The nominal voltage the
MVDC system set ±35 kV.
Three hypothetical scenarios were developed
to provide practical examples MVDC
implementation existing distribution network. Under the same
distribution line conditions, the ±35 MVDC
system has twice the carrying capacity its MVAC
alternative.
Table A-1 provides overview the three
scenarios and summarizes the results the
economic analysis.5% the construction cost. The construction cost the converter
station required for the MVDC system set at
USD 100k/MW. The annual maintenance cost for
the converter station assumed the
construction cost, while the annual maintenance
cost for the remaining distribution lines set
at 2. does not account
for environmental, operational, societal other
benefits. The analysis
compares the cost basic capital expenditure
and maintenance MVDC segments AC
alternatives, using 2025 prices.
Table A-1 MVDC economic modelling scenarios
No Case Supply model Effect
Economic requirement
Capacity
(MVA)
Distance
(km)
1 MVAC MVDC Distribution submarine
cable
Increased line capacity 15~30 >2. The system
marginal price (SMP) for electricity procurement is
applied USD 0.6
2 HVAC MVDC Long-distance
distribution supply
Increased transmission
distance
40~60 >21
3 NOP SOP SOP linkage between
distribution lines
Increased line
utilization
<5 >11
SOP linkage between
transformers
Increased transformer
utilization
<20 –
SOP linkage between
substations
Increased substation
utilization
<30 <22
.
The analysis focuses supply capacity and
supply distance.1/kWh
