innovative automation of electrical design of off shore windfarms to find the least cost option
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INNOVATIVE AUTOMATION OF ELECTRICAL DESIGN OF OFF-SHORE WINDFARMS TO FIND THE LEAST COST OPTION. Infrastructure & Cities Sector, Smart Grid Division Siemens Power Technologies International (PTI) Presenter:Victor Sellwood Dr. Dusko P. Nedic ([email protected])

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innovative automation of electrical design of off shore windfarms to find the least cost option

INNOVATIVE AUTOMATION OF ELECTRICAL DESIGN OF OFF-SHORE WINDFARMS TO FIND THE LEAST COST OPTION

Infrastructure & Cities Sector, Smart Grid Division

Siemens Power Technologies International (PTI)

Presenter:Victor Sellwood

Dr. Dusko P. Nedic ([email protected])

Victor Sellwood([email protected])

presentation overview
Presentation Overview
  • Introduction - why Optimise construction and operation costs?
  • Development and Experiences / Validation of a software tool for automating the electrical design of large off-shore wind farms.
  • Case Study 1 - Edge-located collector platforms vs Central-located
  • Case Study 2 - Comparison of CAPEX / OPEX for offshore windfarms based on publicly-available data
  • Conclusions
why optimise construction operation costs1
Why Optimise Construction / Operation Costs ?
  • UK's Round 3 program will offer 32.2GW / 36GW and there is up-to 80GW offshore in the North Sea
  • 2010: National Grid announced that a radial offshore transmission network is not acceptable
  • 2011: Ofgem report shows that moving from an Independent (radial) to Integrated (mesh) transmission system could reduce Capex from £18B to £15.4B (-16%)
  • A study showed that for only 2 wind farms in the North Sea considering only voltage as a choice, design options would exceed 7,000
  • Image from “Eirgrid_Offshore_Grid_Study_FA Nov2011.pdf”
software tool for automated design
Software Tool for automated design

Tool Features:

  • Three analysis sub-systems
      • Inter-array cable system
      • Off-shore platforms
      • Off-shore transmission
  • Automated design of inter-array cable system and VUI for correcting such designs.
  • Catalogue of components.
  • Creating of network models and possibility of merging them.
  • Cable sizing.
  • Voltage/reactive power control.
  • Electrical losses.
  • Reliability.
  • CAPEX and OPEX evaluation.
slide6
Interactive tool for creating/editing inter-array cable system.

Multiple projects.

Restructure string,

change string origin,

shift platform,

swap strings

between platforms

Find and correct cable

crossovers

Information on the

selected project

Adding/editing

cable knee points

Visualisation User Interface (for modifications of inter-array cable design)

proving the software tool by practical application
Proving the Software Tool by Practical Application

Driven by projects / clients and cooperation with the UK Universities

  • HornSea (over 10 different transmission options with sensitivity analyses)
  • Seagreen (4 different transmission options and a number of sensitivity analyses)
  • UoM Electrical Engineering – research project and a PhD to assess thousands of electrical designs for different offshore wind farm sizes
  • University of Strathclyde – Industry supervision of a 4 year PhD on transmission options in North-Sea. The research will be conducted using the tool.
  • Dogger Bank - Inter array cable design (over 80 layouts – capacity ranging from 7GW to 20 GW)
  • Availability calculations:
    • London Array
    • Greater Gabbard
case study 1 comparison of edge vs central location
Case Study 1: Comparison of Edge- vs Central- location

Centrally Located option (CLo)

Edge Mounted option (EMo)

Each platform 600 MW, 18 strings per platform

(14 of 5WTGs strings and 4 of 4WTG strings).

case study 2 illustrative comparison of design options based on publicly available data
Case Study 2: Illustrative Comparison of Design Options Based on Publicly-Available Data

Investment Cost in £ (Millions)

Cost figures for illustrative purposes only!

case study 2 illustrative comparison of design options based on publicly available data1
Case Study 2: Illustrative Comparison of Design Options Based on Publicly Available Data
  • Case 1 and Case 3 use the same electrical components -> losses are same
  • Case 2 has least electrical losses as no HVDC conversion equipment and good reliability because of the 3 x HVAC shore connections
  • Case 3 has least reliability losses due to redundant string connections
  • Case 4 has most electrical losses as longest string cables, but the least Investment Cost as the quantity of higher gauge cables is less
  • This demonstrates that the differences in Investment are swamped by the differences in Costs of Losses during operation
conclusions
Conclusions
  • This automated approach significantly reduces the time for manual and visual inspection / verification of the proposed cabling system for the layouts
  • Risk of human errors is significantly reduced and re-verifications / inspections can be quick and efficient
  • Effortlessly and quickly design and undertake cost benefit analyses of preferred options.
  • Possibility to merge network models for cost benefit analyses of the off-shore grid.
  • Complex design solutions can easily be compared (both construction and operation) using the most significant comparator: cost
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