Ghaem Sigarchian, Sara

PhD Candidate

Phone: +46 (0)8 790 7476


Visiting address: Brinellvägen 68, 100 44 Stockholm  


Main research question: Are decentralized energy system profitable in terms of energy, economy and environment ? 

Title of the PhD thesis: Decentralized Energy Systems; optimization and performance analysis  

Polygeneration means providing different types of energy (heating, cooling and electricity) in one system at the same time.

In a polygeneration energy system (e.g. micro-grid) we can use different types of local renewable energy sources such as wind, solar and biomass to supply our energy demand locally in a reasonable price. They have several advantages over the conventional energy systems such as higher efficiency, lower transmission losses and lower environmental effects. These systems are flexible, independent and scalable ranging from a single family house to a community.

Having this system does not mean that we should shut down our big power plants or being disconnected from the gird. This is actually a solution for energy demand growth and we should have a combination of both to support each other.

The key factor to success of these types of system is the correct system sizing and configuration at the first place and control strategy and power management during the system operation; Otherwise due to the intermittent nature of renewable energy, the system does not work properly and its efficiency will be low.

The focus of my research is on the system optimization and techno-economic analysis. I want to see under which circumstances the system is feasible and competitive with other solutions; technically, economically and environmentally. I also work with optimal control strategy and energy flow management within the system to improve its performance.

Curriculum Vitae:

I have a master in mechanical engineering specialized in sustainable energy systems from KTH. Currently I am employed as PhD student at KTH Royal Institute of Technology in Stockholm, Sweden.

The focus of my PhD research is on the optimization and techno-economic analysis, optimal control strategy and energy management of autonomous Polygeneration renewable energy systems.

My PhD research is also part of InnoEnergy  which is a European company for innovation, business creation and education in sustainable energy. KIC InnoEnergy fosters the integration of education, research and business (the knowledge triangle), strengthening the culture of innovation and entrepreneurship.

With the support of InnoEnergy and  I am also founder of SolAngel Energy which provides safety and monitoring solution for solar PV panels. 


S. Ghaem Sigarchian, R. Paleta, A. Malmquist, and A. Pina. “Feasibility study of using a biogas engine as backup in a decentralized hybrid (PV/wind/battery) power generation system – Case study Kenya,” Energy, vol. 90, pp. 1830–1841, Jul. 2015.

S. Ghaem Sigarchian (KTH), M. S. Orosz (MIT), H. F. Hemond (MIT) and A. Malmquist (KTH). “Optimum Design of a hybrid PV-CSP-LPG Microgrid with Particle Swarm Optimization Technique,” 2016, Applied Thermal Engineering

S. Ghaem Sigarchian, A. Malmquist, and V. Martin. Optimal planning and design method for complex polygeneration systems: A case study for a residential building in Italy, Submitted manuscript in Energy Conversion and Management journal, 2017

S. Ghaem Sigarchian, A. Malmquist, and V. Martin, “The choice of operating strategy for a complex polygeneration system: A case study for a residential building in Italy,” Energy Conversion and Management, vol. 163, pp. 278–291, 2018

S. Ghaem Sigarchian, A. Malmquist, and V. Martin. Design Optimization of a Complex Polygeneration System for a Hospital, Accepted manuscript in Energies, 2018

S. Ghaem Sigarchian, A. Malmquist, and V. Martin. Design Optimization of a Polygeneration System in Three Climate Zones in Iran – Accepted manuscript in Energies, 2018

S. G. Sigarchian, A. Malmquist, and T. Fransson, “Modeling and Control Strategy of a Hybrid PV/Wind/Engine/Battery System to Provide Electricity and Drinkable Water for Remote Applications,” Energy Procedia, vol. 57, pp. 1401–1410, 2014.

S. G. Fikari, S. Ghaem Sigarchian, and H. R. Chamorro, “Modeling and Simulation of an Autonomous Hybrid Power System,” in 52nd International Universities Power Engineering Conference (UPEC), 2017, November.

Ghaem Sigarchian, S., Strand, T., Spelling, J., & Malmquist, A. (2012). Modeling and Analysis of Hybrid Solar-Dish Brayton Engine. In SolarPACES Conference.


Award for the best poster  in STandUp For Energy Conference 2013,May 2013;Modelling and experimental verification of a small-scale Polygeneration

Grant for pre-study on Swedish Household Energy Solution; AIMday 2013; Sustainable Solutions for Cities; In collaboration with No Picnic AB Company.

Award for best MSc thesis project in the energy field ; Second prize for The Vattenfall Energy Award 2012, November 2012

Special awards in National Robotic Competition 2002

Second Prize in Kharazmi Festival 2002

More information:


Polygeneration Lab at KTH Energy Department

Master Thesis Project :Modeling and Analysis of a Hybrid Solar Dish Brayton Engine

Tillhör: Energiteknik
Senast ändrad: 2018-04-26