LV Network Modelling

Keith DrydenProject Engineer

LCNF Conference 2012

– 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

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.

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 6Tapered 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

11

2 1

3 4

6 5

7 8

9

Existing Power Analysis Tool

Power Analysis Tool Evaluation

• Three Power Analysis Tools evaluated

CYMDIST from CYMEPowerFactory from DigSilent WinDEBUT from EA Technologies

• Chose CYMDIST

Energy Profile HandlingIntegration options with Smallworld Electric Office Engagement with the supplier, CYME

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

Data flow diagram

Implementation – Existing GIS data

Implementation – Transfer to Electric Office

– Large expandable

database facility.

– Electric Office allocates

customer phasing.

– Single line representation

of 3 phase connectivity.

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

Load Flow Analysis

CYMDIST Load Distribution

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

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.

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

END