1. LV Network Modelling Keith Dryden Project Engineer LCNF Conference 2012

2. –Drivers –Existing Power Analysis Tool –Aim –Data Flow Diagram –Implementation –Existing GIS data –Transfer to Electric Office –Transfer to CYMDIST –Load and Generation Profile Manager –Load Flow Analysis –User Cases –Summary Overview

3. Drivers Problem statement –There is a need to enhance the capability of SSEPD’s operational Information Systems, to facilitate the anticipated development of the low voltage network –Modelling tools require accurate network data, but re-drawing of the network in the chosen package is time-consuming and costly, with scope for introducing error –Traditional methods of modelling electrical networks rely on accurate customer loading data; this will become more important when Small-Scale Embedded Generation (SSEG) / Distributed Generation is added to the system.

4. CABLE TYPES USED IN THIS NETWORK Node 1 to Substation 100: WAVE 300mm, 25m Node 1 to Node 2 Tapered section 1: WAVE 95mm, 180m Tapered section 2: WAVE 185mm, 70m Node 1 to Node 3: WAVE 300mm, 25m Node 3 to Node 4 Tapered section 1: WAVE 95mm, 160m Tapered section 2: WAVE 185mm, 90m Node 3 to Node 5: WAVE 185mm, 25m Node 5 to Node 6 Tapered section 1: WAVE 95mm, 135m Tapered section 2: WAVE 185mm, 115m Node 5 to Node 7: WAVE 185mm, 25m Node 7 to Node 8 Tapered section 1: WAVE 95mm, 110m Tapered section 2: WAVE 185mm, 140m Node 7 to Node 9: WAVE 95mm, 25m Node 11 to Substation 100: WAVE 185mm, 1m Existing Power Analysis Tool

5. Power Analysis Tool Evaluation Three Power Analysis Tools evaluated CYMDIST from CYME PowerFactory from DigSilent WinDEBUT from EA Technologies Chose CYMDIST Energy Profile Handling Integration options with Smallworld Electric Office Engagement with the supplier, CYME

6. Aim To Model an LV network capturing data electronically from old and new information systems. –Customer Network data in GIS transferred into suitable format –Integration of Network Modelling Environment with Power Analysis Tool –Modelling and management of new low carbon devices/distributed generation –Accept half hourly load profiles –Run multiple scenarios or variants e.g. 1 day / 1 month / 1 year

7. Data flow diagram

8. Implementation – Existing GIS data

9. Implementation – Transfer to Electric Office –Large expandable database facility. –Electric Office allocates customer phasing. –Single line representation of 3 phase connectivity.

10. Implementation – Transfer to CYMDIST –Re-creates network –Performs calculations on data –Sends to the results to Electric Office –Normal use - no visibility –Selected users can access for in-depth analysis

11. Load Flow Analysis

12. CYMDIST Load Distribution

13. Load and Generation Profile Manager Energy Profiles Manager in CYMDIST Multi Year, future and past Individual End Points / Customer Types Load and Generation Analysis for specific time points, and ranges

14. User Cases Operational Staff –Quick and simple method of confirming a back-feed or mobile generation is within limits Desktop quoter –Simple check against whether new load or generation can connect onto network Network planner –Allow modelling of load/generation growth up to 5 years in advance. New large scale development planning.

15. Summary –Appropriate modelling tool evaluated and tested with Electric Office –Proof of concept model completed – tested with various load profiles –User cases established –Forms the basis of the system for use in the New Thames Valley Vision project

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