ANALYSIS OF MEDIUM VOLTAGE DC OFFSHORE WIND FARM DISTRIBUTION SYSTEM

Abstract

Offshore wind farms are becoming more popular because of advantages such as availability of higher
and uniform wind speeds, availability of the large sea area and proximity to major load centres. Two types of
wind turbine systems for wind power generation exist. Mainly DFIG (30% speed variation) and PMSG (100 %
speed variation) generators are used in wind farms.
To evaluate any power system network, load flow analysis is necessary. But traditional load flow methods such as
the GS and NR-techniques fail to meet the requirements in both performance and robustness aspects of radial
connected wind farm distribution systems. Therefore in this work, the direct approach algorithm is used for wind
farms in which generators are modelled as PQ bus and transmission line modelled using π model in the algorithm.
Basically two types of configuration are possible Medium Voltage AC (MVAC) and Medium Voltage DC (MVDC)
offshore WFDS. Due to lower losses in MVDC offshore WFDS, a today lot of research is going on to design
MVDC offshore WFDS.
The results are presented for both MVAC and MVDC based offshore wind farm distribution system using
MATLAB programming. Finally, a performance comparison has been made between the MVAC and MVDC
based offshore Wind Farm Distribution System (WFDS).