low voltage network solutions plenary session a – monitoring networks dan randles quality of...
TRANSCRIPT
Low Voltage Network Solutions
Plenary session A – Monitoring Networks
Dan RandlesQuality of Supply and Technical Manager/LCNF Tier 1 Manager
2
Aims and Objectives
Aim to improve understanding of existing and future characteristics of Electricity Northwest’s Low Voltage (LV) networks and to aid development of future policy and practice
Three key themes of the project• LV Network Monitoring
• LV Network Modelling
• LV Network Solutions
3 year project started in April 2011 costing £1.5M
3
Network Monitoring
Scope of the deployment• 200 x 11kV or 6.6kV to 415V
distribution substations• Over 1000 LV feeders• Sites comprise indoor and
outdoor, mostly ground mounted with small number of pole mounted transformers
Analogues to be captured• RMS voltages and currents• Real and reactive power• 3ø + neutral • Temperature (Ambient, Tx)• Real-time (1 minute
averages!)• Harmonics (not real time)
Metrology and Communications
(V, I, Q, P, H, Temp)
GPRS/3GPrivate APN
ENWiHost
UoMDB Offline
data transfer
8
Feeder mid-point and end-point
Low Voltage Smart joint takes monitoring beyond the substation
Utilises the Gridkey ‘grid hound’ current sensor
3-phase service cable used for phase voltages (IPCs)
Gridkey metrology and communication unit to be mounted at street level with separate communications channel to iHOST
Metrology
9
Demand characteristics
1 minute resolution provides interesting insights …
… now we just need to understand what it means …
10
Lessons learnt
Installation resources
IT and system integration issues
Customer impact must be minimised
True partnering approach with all project stakeholders
Flexible solutions needed owing to on-site variations
Site surveys essential to avoid problems
Installation quality including anti tamper/vandal
Large volumes of data being generated which needs managing – requires new tools/systems
11
Network Modelling
Topology Information MPAN
InformationConductorInformation
Relationship MPAN-Profile
Class
Profiles Class (half hourly
profile)
ReconnectionModel
OpenDSS Representation
Power Flow Simulation
From GIS
From other Database
Automatic Process
Validate
Extract
Analyse
12
Networks solutions
Its about specifications, standards, policies and practices; understanding how these ought to evolve
The adoption at scale of low carbon technologies will have a significant impact on LV networks
• Voltage rise/drop
• Congestion/overload of assets
Monitoring is key to firstly understanding the capabilities of LV networks both now and in the future and secondly facilitating smart operation
• Trade-off between visibility and cost
• Sampling rates should be appropriate
Appears likely that active means of controlling voltages and loadings in LV networks will be implemented in the future
• Significant change in operation and planning procedures for DNOs