Evaluating Costs and Benefits of a Smart Polygeneration Microgrid Project in a University Campus

Transcription

1 Evaluating Costs and Benefits of a Smart Polygeneration Microgrid Project in a University Campus Stefano Bracco*, Federico Delfino**, Fabio Pampararo**, Michela Robba*** and Mansueto Rossi** University of Genoa - ITALY *Dept. of Mechanical, Energy, Management & Transportation Engineering **Dept. of Electrical, Naval & ICT Engineering ***Dept. of Informatics, Bioengineering, Robotics & Systems Engineering federico.delfino@unige.it

2 Outline of the presentation The Savona Campus: a research & teaching facility of the University of Genoa The Smart Polygeneration Microgrid (SPM) project The Smart Energy Building (SEB) project Economic & Environmental Analysis o o Reduction of annual energy operating costs Reduction of CO 2 emissions Conclusions

3 The Savona Campus: a R&T facility of the University of Genoa 50,000 square meters courses from the Faculties of Engineering, Medicine, and Media Sciences laboratories, research centers and private companies (several operating in the environment &energy field) library, residences, canteen, café, etc

4 The Smart Polygeneration Microgrid (SPM) Project Special project in the energy sector funded by the Italian Ministry of Education, University and Research (amount 2.4 M ) SPM is a 3-phase low voltage (400 V line-to-line) intelligent distribution system running inside Savona Campus and connecting: 2 mchp Gas Turbine (95kWe, 170 kwth) fed by natural gas; 1 PV field (80 kwp); 3 CSP equipped with Stirling engines (3 kwe; 9 kwth); 1 absorption chiller (H 2 O/LiBr) with a storage tank; 1 electrical storage: NaNiCl 2 batteries (100 kwh) 2 PEV charging stations.

5 The Smart Polygeneration Microgrid (SPM) Project SPM one-line diagram: V distribution system (ring network, 500m long) -five switchboards

6 The Smart Polygeneration Microgrid (SPM) Project DEMS planning & management SPM planning, supervision & control system IEC SICAM supervision & control field data acquisitions & local automation RTU TM 1703 ACP

7 The Smart Polygeneration Microgrid (SPM) Project SPM ICT infrastructure

8 The Smart Polygeneration Microgrid (SPM) Project Main goals: to build a R&D facility test-bed for both renewable and fossil energy sources to promote joint scientific programs among University, industrial companies and distribution network operators Day-ahead production scheduling of dispatchable sources and storage exploiting renewables forecast and optimization techniques to optimize thermal & electrical energy consumptions, minimizing the CO 2 emissions, annual operating costs and primary energy use of the whole University Campus

9 The Smart Energy Building (SEB) Project Special project in the energy efficiency sector funded by the Italian Ministry for Environment (amount 3.0 M ) SEB is an environmentally sustainable building connected to the SPM, equipped by renewable power plants and characterized by energy efficiency measures: Geothermal heat pump PV plant on the roof (20 kwp) Micro wind turbine (horizontal axis, 3 kw) High performance thermal insulation materials for building applications Ventilated facades

10 SPM & SEB inside the Savona Campus of the University of Genoa SEB is an active load of the SPM SEB is an energy PROSUMER

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13 Storage-related research activity SPM OPTIMAL SCHEDULING DEMS uses o costs and revenues functions; o forecast of electric and thermal energy demand; o operative constraints (equipment ratings, maximum power ramp, etc.); o forecast of the renewable units production by resorting to weather services and historical records to compute a scheduling for dispatchable sources including storage, which minimizes the daily energy costs. The optimization process has a time-horizon of 1 day (typical of a day-ahead energy market session), subdivided in 15 minutes time-intervals. The optimization method is based on linear programming. This research line results at the storage level in an automatic production shifting application

14 Storage-related research activity PV Production & Demands Production from dispatchable sources Storage state of charge variation on a typical winter day

15 Economic & Environmental Analysis Two different scenarios are considered AS-IS Without SPM & SEB TO-BE With SPM & SEB Electrical Energy National Grid Thermal Energy 2 boilers (gas,1000 kwth) Electrical Energy National Grid + SPM + SEB Thermal Energy 2 boilers + SPM + SEB

16 AS-IS scenario: energy consumptions and operating costs Including also maintenance cost

17 TO BE scenario: share of electricity and heat generation ELECTRICITY 37% delivered by SPM and SEB generation units HEAT 25% delivered by SPM and SEB generation units

18 SPM / SEB energy consumption and production Assumptions: -winter operation for mgts, 2000 hours at rated power -absorption chiller turned off

19 Calculation of the total operating costs for the 2 scenarios C EEC e TEC TES C T _ AS IS AS IS pp AS IS pp m _ AS IS C E e E TES C T _ TO BE el _ Grid pp th _ Boiler pp m _ TO BE where: E E e M p el _ SPM el _ SEB f f _ k f _ k k C65, C30 E EEC E E E E el _ Grid AS IS el _ EHP el _ SPM el _ SEB el _ SEB E TEC E E th _ Boiler AS IS th _ SPM th _ SEB ; M f_k = m 3 natural gas used by each mgt and C m and pf being respectively the maintenance cost and the natural gas price for the mgts

20 Calculation of the total operating costs for the 2 scenarios

21 Calculation of the CO 2 emissions for the 2 scenarios e e O CO EEC TEC LHV f n f NG f 2_ AS IS AS IS AS IS el _ Grid Boiler ef n Eth _ Boliler CO2 _ TO BE Eel _ Grid ef NG Of + M f _ k el _ Grid Boiler LHV k C65, C30 where: e f-n = tco 2 /MWh el (the emission factor of the Italian electrical mix); η el_grid =0.9 (national electrical grid efficiency); e f-ng = tco 2 /m 3 (natural gas emission factor); O f = (natural gas oxidation factor); LHV= MWh pe /m 3 (natural gas lower heating value).

22 Calculation of the CO 2 emissions for the 2 scenarios

23 Economic & Environmental Analysis Economic and environmental benefits provided by the system SPM + SEB can be further increased by: using the mgts in trigeneration asset (resorting to the absorption chiller) in order to cool the library of the Savona Campus (now cooled by means of an electrical heat pump) during summer months (+ 600 working hours for the mgts with respect to the examined case)

24 Conclusions The Sustainable Energy R&D infrastructures under construction at the Savona Campus of the University of Genoa have been described and the main research lines that can be investigated by means of their use have been outlined An approach has been presented to assess the Campus operating costs, CO 2 emissions and primary energy saving on a yearly time-scale It has been shown that the Smart Polygneration Microgrid (SPM) and the Smart Energy Building (SEB) contribute to increase the overall energy efficiency of the Campus, lowering its environmental impact It should be underlined that the revenues obtained by the improved energy performances of the whole Campus can be then employed to financially support research activities and to yearly upgrade the two pilot plants SPM + SEB

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