HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Optimal Accommodation of DG Dr Gareth Harrison Dr Robin Wallace University of Edinburgh, UK

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Overview Planning need Planning tool outline Example of operation Update and future work Adequacy/cost effectiveness of available tools

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Planning Need Voltage rise major issue in rural areas Mitigation techniques exist –Often expensive One alternative is to avoid or limit the need for mitigation in the first place –Indicate where capacity is available Must identify where capacity exists

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Planning Tool Transmission level studies –Distribution level more onerous Various methods applied (GAs, etc.) –DG placement for min loss/investment costs Aim here to maximise DG capacity –Optimal power flow Implemented with PSS/E and bespoke GUI

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May ‘Reverse Load-ability’ Standard PV generator models inadequate Steady state model of DG as negative load Use load shedding minimisation algorithm to add negative load –maximise power injections Termed ‘reverse load-ability’

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May kW DG on feeder 500 kW DG on feeder Low demand profile Simple 11 kV Feeder

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Update Original simplifications removed –fixed taps; lack of traditional generation Transformer voltage control issue –need to mimic voltage Applied to much larger system Consistent and logical results

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Extensive Network

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Future Work Project due to end in September 2003 Other aspects –Economic analysis –Development of capacity expansion strategies Beyond September 2003 –Adapt approach for fault level constraints

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Adequacy of Current Tools Not aware of commercial software tool –Academic tools address some aspects of need Recently developed tools address the need Assessment computationally intensive –Need for re-evaluation with new connections – Move to stochastic standards/planning?

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Cost Effectiveness Costs arise from –setup/integration, input/evaluation, computation and inaccuracy Tool requirements –Easy to use, fast, accurate and can be integrated effectively Some current tools likely to meet criteria

HARRISON UK Author Session 4 – Block 4 – Question 9 Barcelona May Other UoE papers at CIRED This work is part of a larger ongoing programme at the University of Edinburgh Papers presented at CIRED – Intelligent generator control – Domestic CHP – Optimal accommodation of DG