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Connecting Generation to the Grid
Steven Gough Innovation and Low Carbon Network Engineer Western Power Distribution
Presentation Outline
Connecting Generation to the Grid
• Challenges of connecting DG • The connection process • Connection teams • New connection contacts • Heat maps • Alternative connections • Case Studies • Conclusion
Connecting Generation to the Grid
LOW CARBON TECHNOLOGIES
LOW CARBON GENERATION
VOLTAGE RISE/DROP VOLTAGE STABILITY HARMONIC IMPACT THERMAL CAPACITY
BI-DIRECTIONAL ENERGY FLOW EQUIPMENT SUITABILITY POWER FACTOR FAULT LEVEL
Challenges of Connecting DG
The connection process
• Submit application to New Supplies on a ENA form with relevant plans
• Application sent to the relevant department • We clarify any additional information • We prepare the Connection Offer Letter which
included the connection and reinforcement costs • You need to accept the Offer Letter and pay the
deposit • The works are started Top Tip - If you need a cost indication you can request a Budget Estimate free of charge without applying for a full offer or have a discussion with your planner
Connecting Generation to the Grid
Connections teams
• LV generator connections – Local LV planner • Domestic generation • Smaller commercial generation • Up to roughly 200kW export
• 11kV generation - Local 11kV planner • Typically greater 100kW export • Depending on constraints up to 5MW export
• 33kV and 132kV connections - Primary System Design • At least 1MW export • Based in Bristol, Cardiff, Tipton or East Midlands Airport
Connecting Generation to the Grid
Additional information
General information on new connections http://www.westernpower.co.uk/Connections/New-Connections.aspx http://www.westernpower.co.uk/Connections/Generation.aspx
Online applications http://www.westernpower.co.uk/Connections/New-Connections/Apply.aspx
Technical policies http://www.westernpowertechinfo.co.uk/
Connecting Generation to the Grid
Key new connection contacts
Connecting Generation to the Grid
Midlands New Supplies, Records Team Western Power Distribution Toll End Road Tipton DY4 0HH
South Wales New Supplies, Records Team Western Power Distribution Phoenix Way Llansamlet Swansea SA7 9HW Tel 0845 601 3341 Fax 01792 784510 Email [email protected]
South West New Supplies, Records Team Western Power Distribution Lostwithiel Road Bodmin Cornwall PL31 1DE Tel 01208 892288 Fax 01208 892292 Email [email protected]
Tel 0121 623 9007 Fax 0115 876 7458 Email [email protected]
Heat Maps
• Estimated capacity on 11kV/LV substations • Highlighted 33kV with voltage or thermal issues • Greater visibility of our network.
Connecting Generation to the Grid
Alternative Connections Due to the increasing amount of generation being developed in a number of constrained areas, alternative connections are being offered which will enable a greater amount of generation to be connected when the network is able to absorb this energy. The cost, complexity and application of the curtailment can be tailored to meet the needs of the connecting generator. The benefit of these connections not limited to a reduction in connection costs, they can also reduce timescales for connection.
Connecting Generation to the Grid
Timed Intertrip Active
Connecting Generation to the Grid Alternative Connections
TIMED
• Generation curtailed within specific times
• Sub 1MVA • Modelled seasonal
capacity variations • Localised control only • No comms • May have for voltage
constraint • Non-optimised
SOFT-INTERTRIP
• Releases pre-fault capacity with trip facility
• 11kV and 33kV • Real-time monitored
values • Small clusters of
generation or simple pinch points
• Existing monitoring with localised control
ACTIVE NETWORK MANAGEMENT
• Fully optimises capacity based on all constraints
• Management of generation using LIFO principles
• Real-time granular control of output
• Requires new Active Network Management control and monitoring systems
Costs, Complexity & Network Optimisation
101010110100
Connecting Generation to the Grid
Timed – Case Study • 350kW River Hydro
scheme • 10MW PV on constrained
circuit • 2MW capacity DG
headroom estimated • Connection times: - October to March = Full
350kW export - Apr & Sept = 150kW
10am to 4pm, full 350kW at other times
- May to Aug = Nil export 10am to 4pm, full 350kW at other times
Intertrip – Case Study • 18MW Mixed Biomass /
Energy from Waste, PV and Wind
• 9MW firm plus 9MW constrained
• Hybrid conventional and smart solution developed
• Trip signal from Spalding on voltage rise or reverse power
• Enmac analogues to be transmitted to customer to allow them to “throttle back” DG to avoid trip signal.
Active - Case Study • Offers issued • Offshore Wind • Uplift to 94.7MVA
output (from 90MVA) • Deploys ANM
equipment at Skegness and Boston
• Utilises Dynamic Line Rating on 132kV double circuit line
- Multiple £m conventional solution required reconductoring of Boston/Skegness – not quoted at customer request
Conclusion
Distributed Generation is currently being adopted on an unprecedented scale
Connecting Generation to the Grid
There is a wealth of information on WPD’s website to help with new connections. Alternative connections have been implemented to help reduce the cost due to reinforcement for new generators.
