Carmeliet

Contact

Boran Morvaj room EMPA
PhD Student email Boran.Morvaj@empa.ch

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Profile

Boran Morvaj received his MSc degree in Electrical Engineering and Information Technology at Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia in July 2013. For his Bachelor thesis he analyzed and simulated controllable loads and small renewable energy sources potential in the smart grid environment based on agent based modeling and system dynamics. In Master study his research focus moved to the buildings and his Master thesis was about energy management of low energy buildings. During the study, he was junior researcher at the international NATO sponsored project dealing with testbed simulator for improving SCADA performance in the smart grid environment. This was followed by junior project engineer position in a company for developing net ze-ro energy buildings. In January 2014, he started his PhD project at ETH Zurich (Chair of Building Physics, Department of Architecture), supervised by Prof. Jan Carmeliet.


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PhD topic: Holistic optimisation of distributed multi energy systems for sustainable urban areas

Energy systems have to become more sustainable to mitigate climate change effects, and urban areas and their energy systems are an important focal point. Distributed multi energy systems (DMES) can be a key enabling factor for the transition. They consist of distributed energy resources (e.g. PV and CHP), energy stores and energy networks (e.g. district heating). The aim is to satisfy simultaneously various energy demands (e.g. heat and electricity) in an optimal manner

However, the introduction of DMES also results in more complex challenges in terms of design and operation as it combines types of energy that were traditionally separated. Furthermore, integration of components of DMES in existing electrical grids is not straightforward; a key challenge is how to integrate a large share of renewables, which are inherently intermittent, at distribution level in the existing electrical grid.

This requires holistic approach to evaluate simultaneously all options and interdependences. An optimisation model has been developed that can determine simultaneously optimal design and operation of a distributed energy system, district heating network layout and evaluate should the distribution grid be upgraded while ensuring that the solutions are within the distribution grid limits using linearized AC power flow. The model is based on the coupling of an energy hub modelling approach for building systems design, building energy simulations for obtaining heat and electrical demand profiles, an electrical grid model for power flow calculation, constraints and grid upgrade possibility, and district heating network design.

Figure 1. Overview of the developed model

The model is then used to explore how existing urban areas can be best transformed into sustainable ones and to explore the balance between electrical and thermal transport of energy that this facilitates. The underlying questions are: should the networks be pure electrical so that electricity is used for electrical and heating demand?; when should buildings be connected by heating network?; what is the optimal network layout?; is there a trade-off between installing heating network and upgrading the distribution grid to integrate more renewables?; how should the buildings be designed and operated for different levels of renewable energy share in the electric grid supply?

Figure 2. Analysis of transition towards sustainable urban areas


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Publications

Journal papers

1. B. Morvaj, R. Evins;, J. Carmeliet (2016) Optimisation framework for distributed energy systems with integrated electrical grid constraints, Applied Energy
2. B. Morvaj, K. Knezović, R. Evins, M. Marinelli (2016) Impact of Distributed Energy Systems and Electric Vehicle Flexibility on Carbon Emissions in Low-Voltage Distribution Grids, submitted to Sustainable Energy, Grids and Networks
3. B. Morvaj, R. Evins;, J. Carmeliet (2015) Optimising urban energy systems: simultaneous system sizing, operation and district heating network layout, submitted to Energy

Conference proceedings

1. B. Morvaj, R. Evins;, J. Carmeliet (2016) Impact of electrical storage and grid upgrade on the optimal design and operation of a microgrid, In: 2016 IEEE Power & Energy Society General Meeting, Paving the way for grid modernization, Boston, MA, USA, July 17th – 21th 2016.
2. B. Morvaj, R. Evins, J. Carmeliet (2015) The impact of low energy buildings on the optimal design of distributed energy systems and networks, In: 14th International Conference of the International Building Performance Simulation Association (IBPSA), BS 2015, Hyderabad, India, December 7th – 9th 2015.
3. B. Morvaj, R. Evins, J. Carmeliet (2015) Bi-level optimisation of distributed energy systems incorporating non-linear power flow constraints, In: International Conference Future Buildings & Districts, Sustainability from Nano to Urban Scale, CISBAT 2015, Lausanne, Switzerland, September 9th – 11th 2015.
4. B. Morvaj, R. Evins, J. Carmeliet (2014) Optimal selection and operation of distributed energy resources for an urban district, In: Engineering Optimization (ENGOPT) 2014, Lisbon, Portugal, September 8th – 11th 2014.
5. B. Morvaj, B. Jurišic, N. Holjevac (2013) Stochastic Simulation of the Smart Grid and Demand Re-sponse Implementations on a City-wide Scale. In: Convention on Information and Communication Technology, Electronics and Microelectronics, Opatija, Croatia, May 2013.
6. B. Morvaj, T. Dragicevic, S. Krajcar (2013) Controllable Photovoltaic Grid Power Injection with an Assistance of Energy Storage System, In: 4th International Conference on Power Engineering, Energy and Electrical Drives, Istanbul, Turkey, May 2013.
7. B. Morvaj, L. Lugaric, S. Krajcar (2011) Demonstrating Smart Buildings and Smart Grid features in a Smart Energy City, In: International Youth Conference on Energetics, Portugal, July 2011.

Book chapter

1. Z. Morvaj, L. Lugaric, B. Morvaj (2012) Smart Energy Cities - Transition Towards a Low Carbon Society. “Energy Efficiency – A Bridge to Low Carbon Economy” published by InTech 2012
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