LV Network Templates for a Low Carbon Future

Mark Dale & Gavin Shaddick26th October 2012

OutlineWhy do we need LV templates?

Monitoring & Data: • How are we monitoring?• The Data Journey• Lessons Learnt

Statistical Analysis:• Overview• Clustering methodology• Classification

Steps Forward

Why do we need LV Network Templates?

New Challenges

• Lack of real data/ understanding of the LV Network

• Assets on the network are expensive

• Growing consumer market more connections

• Consumer Prosumer adopting more green technology e.g. PV, SHP

LV Network Templates

What does the LV Network Templates project deliver to you?

• Identify the impact of low carbon technologies on the LV Network and enable the creation of LV Templates

• Identify the possibility of using proxy FIT meters to reflect local area generation output

• Share findings with all interested parties including other DNO’s

Monitoring &

Data

Sub-station Enclosure

EDMI Customer Monitoring

Ground Mounted

Pole Mounted

Street Furniture: Haldo Pillar

How are we monitoring?

800 Sub-station Monitors3500 Voltage Monitors120 PV Monitors

The data journey• Primary data (variable)

• Secondary data (fixed)• WAG ARBED• Fixed distribution sub-station data• SSEG generation data

Lessons Learnt• Majority of householders not receptive to installation of voltage

monitors• do not understand the role of a DNO • saw WPD’s approaches as sales calls

• Multiple routes required for communication to maximise impact and reaction• consider using trusted and known organisations

• Make more use of the initial phase-check visit• educate householders about WPD and the meter to be installed• combine with site survey to speed up the installs

Statistical Analysis

Overview

• Develop network templates• Use statistical clustering

techniques• group sub-stations based on

load profiles• Overlay fixed data onto

resulting clusters

• Create set of classification rules

• Using three months of data we have already started to identify clusters which form basis of templates

Example of data received over 24 hour period (Wed. 25th July)

Statistical methodology: clustering

• Based on (dis)similarities in the data• Data structured according to - Time (within days, 10 min intervals) - Date (days, months, season) - Sub-stations • Real Power Delivered (RPD)• Allocates ‘units’ to groups (clusters)

Dendrogram• Black vertical lines indicate how sub-station clusters join together• Highest level split is commercial (left) and residential (right)• Further splits are based on magnitude (RPD) and temporal patterns

Classification

1. Domestic Unrestricted (single rate)2. Domestic Economy 7 (two rate)3. Non-Domestic Unrestricted (single rate)4. Non-Domestic Non-Maximum Demand Economy 7 type (two rate)5. Non-Domestic Max. Demand Customers with Load Factor 0-20%6. Non-Domestic Max. Demand Customers with Load Factor 20-30%7. Non-Domestic Max. Demand Customers with Load Factor 30-40%8. Non-Domestic Max. Demand Customers with Load Factor >40%

• Sub-station clusters contain a mix of customer profile classes

• Clusters based on overall levels of RPD (kW) and different temporal patterns

Sub-station profiles over time (within day)

Sub-station profiles over time (weekly)

• Clusters exhibit different patterns of RPD (kW)

Steps Forward…

• Primary data is being continuously received• Update clustering • Refine classification rules• Create a set of LV templates

• Identify stresses on LV networks due to low carbon technologies

• WPD and DNOs to discuss LV Network Templates and their applicable use

Questions?