Microgrid at Italian university generates savings, knowledge.

Published: Thu 05 Jun 2014
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Autonomy and flexibility can support energy resilience, while also benefitting the power grid. This February, the Savona campus of the University of Genoa, Italy, opened a campus-wide microgrid -- the first of its kind in Europe. It combines both electrical and thermal energy resources, as well as thermal and battery storage. All of this technology is orchestrated by a state-of-the-art microgrid management system.

Currently this microgrid encompasses sufficient resources to supply about half of the campus' current energy needs -- and it was designed to accommodate additional resources to eventually power the campus fully.

On June 5, a free IEEE Spectrum webinar will explore the details and strategies of the Savona microgrid project.

Integration of renewable (rooftop photovoltaic and concentrating solar generation) and traditional power generation sources using the Siemens Microgrid Manager system is a key aspect of this microgrid. This project also is distinguished by the combination of electrical and thermal energy. It also includes two newly installed cogeneration units, and small gas turbine originally on the campus was incorporated as well.

Other integrated equipment includes electrochemical battery storage, two existing boilers, and an absorption chiller. There are also two electric vehicle charging units, managed by the Siemens E-car Operation Center.

The total electrical power installed is equal to about -250 kWe plus 140 kWh of available storage capacity. All additional energy is supplied by the national power grid.

After being awarded the public tender for this project, Siemens took over as primary contractor, coordinating work on the project in cooperation with the Power Systems Research Team -- more than 10 researchers representing various engineering disciplines at the University of Genoa. Siemens engineers and other industry and power grid partners also collaborated on this project.

The design phase was especially important. Bernd Koch, Director of Siemens Microgrid, Energy Automation, noted: "Siemens has now set up an expert team to support our customers in this crucial phase, based on our experience in Savona. This, in combination with the ability to translate requirements into technical interface descriptions for generation and load during the project, is a key competence which has been developed within Siemens."

How the Savona microgrid works

Siemens supplied the heart of this microgrid: a control room featuring the Siemens Microgrid Manager. This includes an electrical SCADA (based on Siemens Sicam technology), a thermal SCADA and a centralized energy management system for the microgrid. Together these systems receive signals and data from the field and communicate with installed devices, using a Siemens gateway via wired and wireless connections.

The Microgrid Manager control system dispatches thermal and electrical generation resources as well as energy exchange with external grid, taking into account contributions from renewable resources and the weather forecast. Generation forecasting is conducted daily as well as three days in advance. The Microgrid Manager adapts in nearly real time (every 15 seconds) to actual weather conditions.

"If actual weather conditions differ from the forecast, the system can immediately optimize microgrid management," said Federico Delfino, Professor of Power System Engineering at the University of Genoa, and a leader on this project. "The Microgrid Manager understands that if there's no sun, it needs to adjust the power being produced. It gives the right setpoint to the gas turbine to balance the load on campus."

Claudia Guenzi, CEO of Siemens Smart Grid Division (Italy) explained: "Before the microgrid, the turbine and boilers were mostly operated manually. But now there's a central intelligence to guarantee optimum scheduling and operation of the whole energy resources installed."

During implementation, Siemens offered a constant exchange of idea and information with the university. "We worked closely with the University of Genoa to identify the most appropriate technical partners to meet the project technical requirements, complementing the Siemens portfolio," said Guenzi.

One of this project's main challenges was getting all of the equipment to communicate with the Microgrid Manager. All microgrid-connected equipment, regardless of supplier, can interact using the same international standard protocol, IEC-61850.

"Sometimes we spent days figuring out how to connect individual devices to the gateway, or how to define the list of signals, measures and parameters to be exchanged. But this learning will certainly benefit many future projects," Guenzi noted.

Benefits on campus and beyond

The Savona microgrid will cut campus energy costs by an estimated 50,000€ per year, reduce carbon dioxide emissions by about 120 tons annually, improve operational efficiency, and demonstrate effective control systems and strategies. But beyond that, this project is yielding considerable benefits outside the Savona campus. It's currently testing innovative microgrid energy management strategies, via the Siemens Microgrid Manager.

Delfino, who also serves as scientific lead for the microgrid project, noted that that siting this microgrid project at an engineering research university is vastly increasing the knowledge base and data about microgrids.

"This microgrid is a test bed for ongoing research, and it's getting a lot of attention." said Delfino. "Every week we get e-mails and visits from faculty and engineers from all over Europe. Also, everything we're learning here can be applied in the context of a smart city."

Theoretically, the Savona microgrid also can benefit the national grid. "We are ready to exchange data and information with the national grid, as well as receive dispatching commands from the grid control center. This will allow us to involve on-campus microgeneration in ancillary services to Italy's energy market," said Delfino.

What's next for the Savona microgrid

Regulatory hurdles to realizing this vision are being addressed. "What is currently missing in Italy is a set of regulations to clarify how the national grid can benefit from the microgrid," said Guenzi. "Italian regulators are working on this. We're expecting new rules during the next regulatory period, probably in 2015. This should allow the microgrid to provide full benefits to the national grid.

Currently no campus buildings are directly connected to the microgrid. However, the university recently issued a new public tender to connect a new campus building to the microgrid. This will help with the exploration of extended microgrid strategies for load management.


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