INTEGRATED OPERATION OF AN ENERGY MICROGRID WITH ISLANDED ELECTRICITY NETWORK B. Awad, J. Wu, J. Ekanayake and N. Jenkins Centre for Integrated Renewable Energy Generation and Supply, Cardiff University

Frankfurt (Germany), 6-9 June 2011  The energy policy of the UK  Renewables, MicroGeneration, CHPs, and District heating  Community energy systems and Energy MicroGrids AWAD–UK–RIFS4–0344 Background

Frankfurt (Germany), 6-9 June 2011  An electricity MicroGrid  A District Heating System.  Interconnected at the CHP Unit  Both serve the same group of consumers.  Generation/demand balancing is a challenge AWAD–UK–RIFS4–0344 Energy MicroGrid

Frankfurt (Germany), 6-9 June 2011  Should heat and electricity networks of the Energy MicroGrid be operated as an integrated system or as two independent systems?  Study tool: The Integrated Optimal Power Flow Non-Integrated OperationIntegrated Operation CHP Unit Supply Temperature ConstantVariable Heat-to-Power ratio (function of the supply temperature) ConstantVariable Load following Heat drivenFlexible Electricity to heat conversion Not availableAvailable Thermal storage Not availableAvailable AWAD–UK–RIFS4–0344 Operation of the Energy MicroGrid

Frankfurt (Germany), 6-9 June 2011 Case Study  24 hours study period  Islanded electricity network  IOPF used to produce optimal schedules  Integrated operation minimises the need to shed loads and to curtail generation AWAD–UK–RIFS4–0344 Generation curtailed Demand shed

Frankfurt (Germany), 6-9 June 2011 Conclusion  Energy MicroGrids  Integrated vs. Non- Integrated Operation  Integrated Optimal Power Flow for Heat and Electricity  Advantages of the Integrated Operation AWAD–UK–RIFS4–0344