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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
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 Reduction of annual energy operating costs
o Reduction of CO2 emissions
• Conclusions
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…
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 (H2O/LiBr) with a storage tank;
• 1 electrical storage: NaNiCl2 batteries (100 kWh)
• 2 PEV charging stations.
The Smart Polygeneration Microgrid (SPM) Project
SPM one-line diagram:- 400 V distribution system (ring network, 500m long)-five switchboards
The Smart Polygeneration Microgrid (SPM) Project
SPM planning, supervision & control system
RTUTM 1703 ACP
planning & management
supervision& control
field data acquisitions &local automation
IEC 61850
SICAM
DEMS
The Smart Polygeneration Microgrid (SPM) Project
SPM ICT infrastructure
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 CO2 emissions, annual operating costs and primary energy use of the whole University Campus
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
SPM & SEB inside the Savona Campus of the University of Genoa
• SEB is an “active load” of the SPM
SEB is an energy “PROSUMER”
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
Storage-related research activity
Storage state of charge variation on a typical winter day
Production from dispatchable sources PV Production & Demands
Economic & Environmental Analysis
• Two different scenarios are considered
AS-ISWithout SPM & SEB
TO-BEWith SPM & SEB
• Electrical Energy → National Grid + SPM + SEB• Thermal Energy → 2 boilers + SPM + SEB
• Electrical Energy → National Grid• Thermal Energy → 2 boilers (gas,1000 kWth)
AS-IS scenario: energy consumptions and operating costs
Including also maintenance
cost
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
SPM / SEB energy consumption and production
Assumptions:
- winter operation for mGTs,2000 hours at rated power
- absorption chiller turned off
Calculation of the total operating costs for the 2 scenarios
_ _T AS IS AS IS pp AS IS pp m AS ISC EEC e TEC TES C
_ _ _ _
_ _ _ _65, 30
T TO BE el Grid pp th Boiler pp m TO BE
el SPM el SEB f f k f kk C C
C E e E TES C
E E e M p
where:
_ _ _ _ _el Grid AS IS el EHP el SPM el SEB el SEBE EEC E E E E
_ _ _th Boiler AS IS th SPM th SEBE TEC E E
and Cm and pf being respectively the maintenance cost and the natural gas price for the mGTs
; Mf_k = m3 natural gas used by
each mGT
Calculation of the total operating costs for the 2 scenarios
where: ef-n = 0.465 tCO2/MWhel (the emission factor of the Italian electrical mix); ηel_Grid =0.9 (national electrical grid efficiency);
ef-NG = 1.961·10-3 tCO2/m3 (natural gas emission factor);
Of = 0.995 (natural gas oxidation factor);
LHV=9.7·10-3 MWhpe/m3 (natural gas lower heating value).
Calculation of the CO2 emissions for the 2 scenarios
2__
f n f NG fAS IS AS IS AS IS
el Grid Boiler
e e OCO EEC TEC
LHV
_2 _ _ _
65, 30_
+f n th BolilerTO BE el Grid f NG f f k
k C Cel Grid Boiler
e ECO E e O M
LHV
Calculation of the CO2 emissions for the 2 scenarios
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)
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, CO2 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
Thank you for the attention
Federico DelfinoUniversity of Genoa – ITALY
Dept. of Electrical, Naval & ICT Engineering
Vale!