SERVICING OFFSHORE WINDFARMS FEATURE - PART 2
CONDITION MONITORING OF OFFSHORE WINDFARM MV/ HV NETWORKS
Offshore wind generation currently remains the most expensive renewable energy option at an estimated Levelised Cost of Electricity (LCOE) of £135 per MWh generated over the expected 20-year lifetime of the asset (c.f. to LCOE of £60/MWh for onshore wind). The UK Government’s Department of Energy and Climate Change (DECC) has identified that a reduction in the high operating and maintenance (O&M) costs of the offshore wind farms is essential to drive down costs and to make this source of renewable electricity more affordable.
Figure 1: MV and HV network for a typical ‘Round 2’ UK 500MW + offshore windfarm
BENEFITS OF CONDITION MONITORING Unplanned outages from medium voltage (MV - 33kV) and high voltage (132kV+) cable faults can lead to significant down time and lost revenue for offshore windfarm operators. In order to ensure continued operational reliability, more effective risk management and to help reduce the presently high O&M costs, it is recommended that the operators apply Condition-Based Management (CBM) regimes to their MV/HV cable networks. The efficacy of any such CBM scheme will be largely dependent on the quality and reliability of the condition monitoring (CM) data from which resultant repair/replace/ retain engineering decisions are made.
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www.windenergynetwork.co.uk
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