Research Line B
Energy Efficiency
Main Research Areas
Depending on the period, the group was composed by 4 to 7 PhD researchers (two since 2010, one retired in 2011), and several PhD and MSc students.

The main objectives of the group were, in line with main objectives of CTS:

  • To develop the inherent activities and increase the productivity always improving quality and merge all the knowledge and different expertise from sub research-areas of CTS targeting the design of complete energy based solutions.
  • To reinforce national and international cooperation emphasizing interdisciplinary work, namely integrating complete SoC solutions;
  • To encourage all staff and PhD students to disseminate their research results priory in journals with major 5-Years impact factors and in leading international conferences (accordingly to the DEE Publishing Reference List);
  • To reinforce work and collaboration in the area of energy efficiency and related areas.

The group intends to apply electronics and electrical sciences for the enhancement of industrial processes and energy efficiency. So, the research is focused on electrical energy efficiency and sustainable development of inherent technologies.

Particular areas of interest are:

  • Alternative Energies and Electrical Drives
    1. Electrical Drives Design
    2. Fault Diagnosis and Fault Tolerant Operation
    3. Control and Simulation
    4. Intelligent Control and Power Quality
    5. Alternative Energies and Intelligent Buildings
    6. Smart and micro grid / building integration

      This is concerned with intelligent drives and intelligent buildings, along with their integration in the smart/micro grid context. The design, supply, operation and control of electrical drives, to meet future demand of energy usage while satisfying current and future environmental constrains are considered. These concerns cover several topics, from supplied energy, design of the drive itself, its control and related power quality issues, fault diagnosis and fault tolerant operation, to its integration into modern intelligent facilities. Also energy efficiency issues, either in intelligent buildings (considering their renewables and grid integration) or in end-user energy efficiency awareness, are considered. The research approach involves not only technological issues but also mathematical and computational techniques for modelling, estimation and control of these systems.

  • Superconductivity and Low Temperature Electrotechnics
    1. Design and Modelling of Power Systems Employing High Temperature Superconductors
    2. Fractional Horsepower Superconducting Motors
    3. Superconducting Fault Current Limiters
    4. Superconducting Magnetic Energy Storage
    5. Characterization of Electrical Materials and Devices at Cryogenic Temperatures
      This area is related with application of high temperature superconductors (HTS) in power systems, due to the specific properties of these materials, as flux pinning, diamagnetism and low losses when compared to conventional conductors. Amongst the investigated systems there is a focus on fractional horsepower motors, fault current limiters and energy storage. Other aspects are developed, as cryogenic characterization of ferromagnetic materials or power electronics for cryogenic drives. A strong effort is dedicated to the development of modelling techniques for design and simulation of HTS materials and devices.
  • Modern Electric Energy Processing
    1. Advanced Power Electronics and Modern Energy Converters
    2. Wireless Energy Transfer
    3. Induction Heating (High and Middle Frequencies)
    4. Electric Vehicles and Hybrid Electric Vehicles, Battery Management
    5. Energy Harvesting, Energy Recuperation, Self-Powered Energy Consumers
    6. Conversion of Renewable Energies, Efficiency Maximizing
    7. Grid and End-User Efficiency


This involves recent trends in power electronics aimed to achieve: a) highest possible efficiency of power convertors (e.g. through soft switching and resonant conversion); b) efficient storage of energy (e.g. modern battery stacks management); c) efficient utilization of environment energies (e.g. mechanical, thermal, electromagnetic) as additional autonomous sources of electrical energy (including the specific power converters); d) most convenient and efficient transfer of electrical energy applying non-conventional methods (e.g. contactless charging, high-frequency energy beams, etc.)
© 2017 - Centre of Technology and Systems - Research Unit 13/66 - FCT Campus