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Demonstrating the benefits of energy storage on an 11 kV Distribution Network Matthieu Michel – Technology Innovation a

Demonstrating the benefits of energy storage on an 11 kV Distribution Network Matthieu Michel – Technology Innovation and Co-ordination Manager. Project Objectives:. Validate the capabilities of a Li-ion Energy Storage System (ESS)

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Demonstrating the benefits of energy storage on an 11 kV Distribution Network Matthieu Michel – Technology Innovation a

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  1. Demonstrating the benefits of energy storage on an 11 kV Distribution Network Matthieu Michel – Technology Innovation and Co-ordination Manager

  2. Project Objectives: • Validate the capabilities of a Li-ion Energy Storage System (ESS) • Demonstrate load-shifting and other interventions within the limits of the device • 200 kW, 1 hour discharge duration • 600 kW, short durations • Evaluate the network benefits: accommodate additional demand and generation • Understand the potential lifetime of the device • Presentation: • Early results from Operation of the device • Key considerations: Efficiency, Losses, cost of energy

  3. Progress Highlights: • The storage device has operated as a STATCOM since commissioning (April 2011) • Exchanges of real power have started (May 2012) • Network diagram Wind farm (10 turbines) 2.25MW Hemsby (Energy Storage System) Martham Primary Site where Additional monitoring is being installed Ormesby Primary

  4. Voltage at Hemsby without ESS (simulated data) Voltage at Hemsby with ESS (Simulated using real data) Operation: STATCOM High Voltage event caused by windfarm output triggering ESS to import reactive power 11.07 D E A D B A N D Increase in windfarm output resulting in voltage increase 10.85 Low Voltage triggering ESS to export reactive power 19/04 18/04 20/04 Windfarm Output ESS Reactive Power

  5. Operation: STATCOM Settings Change - July 2012 • Tightened under and over voltage targets from 10.96kV ± 0.11kV, to ±0.08kV • kVAr exchanged with the network (Number of occurrences) / Voltage band AFTER SETTING CHANGES 10.96kV ± 0.08kV BEFORE SETTING CHANGES 10.96kV ± 0.11kV Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8

  6. Operation: Real Power Exchanges - May 2012 Demand increase due to evening peak Fluctuations due to Windfarm output or variation in demand Drop in demand due to export from ESS Increase in demand due to switching from Export to Import

  7. Considerations: Round Trip Efficiency and Losses • The overall round trip efficiency of the installation is quoted to be more than 90% AUXILIARIES • Several components will impact the efficiency and losses • 50kW discharge scenario: • 49.7 kW delivered by batteries • 48 kW delivered to network • Each component is being assessed individually 1MVA STEP UP TRANSFORMER (2.2kV to 11kV) AND CIRCUIT BREAKER 48 kW Li-ION BATTERIES 49.7 kW SVC Light POWER CONVERSION SYSTEM (DC to AC)

  8. Considerations: Energy cost and Battery life Hemsby import charge • On the current Hemsby tariff • Energy import charges will be higher than • the revenue that can be generated from • exporting a similar amount of energy Export revenue (80% System Sell price) Worst case Optimised • Battery life will depend on: • Number of cycles • Depth of discharges • 1 x daily cycle @ 80% depth of discharge: 10 years • 1 x daily cycle @ 40% depth of discharge: 20 years • The impact of each mode of operation on the battery life will be considered 40% / 10,000 Cycles 80% / 3,000 Cycles

  9. Next steps: Device Operations Control mode 4: Algorithmic control based on real time network measurements and wind farm output Benefit demonstration started Benefit to be demonstrated Management of Peak power flows Management of voltages across feeders Reduce reverse power flows Improve Power factor Control mode 3: Remote operations Now Switching between feeders Control mode 2: On-site Manual Combine Voltage stabilisation + Real power exchanges Voltage stabilisation (different set points) Control mode 1: No intervention Management of peak power flows – Time of day Voltage stabilisation Oct 13 July 12 Jan 13 Apr 11 May 12

  10. Conclusions: • The storage device is performing as expected: Reduce voltage fluctuations and manage power flows • The early stages of the project have been challenging: • Energy contract, IT connections, troubleshooting issues following commissioning. • Submitted request for extension: October 2013 • More work is to be done but there is learning to be shared: Early learning report published. Copies available at the UK Power Networks stand

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