The power electronics group uses the power electronics facilities in order to work with industry and offer educational activities such as the power electronics and smart grids courses. In addition, researchers from the power electronics group perform their studies using the modern equipment.
Main activities are
In the frame of an European project H2020, HyFlow, the team in the power electronics laboratory is developing a test bench for testing and cycling a Vanadium Redox Flow Battery. https://hyflow-h2020.eu/. The test bench consists of a bidirectional DC/DC converter which can deliver and absorb more than 120A. The main idea is to perform the polarization curves and other dynamic tests.
Main participants: Mr. Adrien Rosselet, Mr. Yaroslav Vlasor, MSc. Ildar Idrisov and Prof. Ibanez.
|Design, development and test of three fully-controlled inverters for working in grid-forming and grid-following modes.Main participants: Mr. Yaroslav Vlasov, MSc. Ildar Idrisov, Prof. Ibanez, Prof. Vorovev.|
|Advanced control systems were developed for the home uniterruptible power supply which Watts battery produces, in the frame of single-phase grid-inverter. Advanced digital signal processors were using for that purpose.Main participants: MSc. Ildar Idrisov and Prof. Ibanez.|
The research activities are divided in;
– PhD and researchers activities
The master theses can be found here. There you can find a short description of the activities and links to further information including articles and conference papers. The research activities of PhD students and researchers can be found below.
|Mr. Davalos has been working in low voltage multi-modular converters for supercapacitors. He was researching and developing an efficient low-voltage cell that can be connected in series or in parallel in order to create an energy storage system for AC grids or DC grids. The module is totally independent, it includes the storage device, the balancing system and the power conversion.|
|Mrs. Victoria Gasca has been exploring the flexibility of the thermal heaters in a distributed system in order to provide services to the grid. Particularly, she focused her attention in grid frequency regulation. Her research has been recently published in:María Victoria Gasca, Federico Ibáñez, David Pozo, “Flexibility quantification of thermostatically controlled loads for demand response applications,” Electric Power Systems Research, Volume 202, 2022, 107592,
ISSN 0378-7796, https://doi.org/10.1016/j.epsr.2021.107592.
The need for flexible networks is an emerging challenge for power system operators (SO). The use of additional support, such as demand response (DR), must be quantified in order to offer a reliable service, given that this information is vital for demand aggregators. Thermostatically controlled loads (TCLs) are one of the most promising options among DR solutions; due to TCLs’ thermal characteristics their power may be increased or reduced accounting as ancillary services. However, TCLs tend to synchronize their behavior, which may affect their capacity to provide flexibility.
This paper proposes a method for quantifying TCLs’ power flexibility, taking into account different scenarios, types of controllers and loads. Two control methods are compared, and a modified control algorithm is applied to the controllers under analysis to avoid TCL synchronization. The analysis was validated by simultaneously using real demand data from the UK National Grid and temperature data for the same region and time frame.
|Mr. Rahim Samanbahksh is currently working in a new type of Z-source converter for energy storage. Z-source converters has many advanteges in comparison with traditional converters. They can work as step-up or step-down converters, can tolerate short circuits and can deliver AC or DC signals. Rahim is focused on minimizing the in-rush current and the harmonic distortion when the Z-source converter works as an inverter.|
|Mr. Rahim Samanbahksh has been studied a new type of multilevel converter that can reach up to 15 leves using a single module and if cascaded, it can reack 127 levels, minimizing the signal distortion and allowing to work at very low switching frequencies, even grid frequencies. His work was recently published in IEEE Access:R. Samanbakhsh, F. M. Ibanez, P. Koohi and F. Martin, “A New Asymmetric Cascaded Multilevel Converter Topology With Reduced Voltage Stress and Number of Switches,” in IEEE Access, vol. 9, pp. 92276-92287, 2021, doi: 10.1109/ACCESS.2021.3092691.|
|Prof. Ibanez has been working in the design of balacing systems for supercapacitors considering the manufacturer’s tolerances. He analyzed two types of balancing methods: passive and active systems. Details are given in:F. Martin Ibanez, I. Idrisov, F. Martin and A. Rujas, “Design Balancing Systems for Supercapacitors Based on Their Stochastic Model,” in IEEE Transactions on Energy Conversion, vol. 35, no. 2, pp. 733-745, June 2020, doi: 10.1109/TEC.2020.2968364.|
|Mr. Davalos and Prof. Ibanez have been researching on measurements units at high voltage. A method to increase the signal-to-noise ratio is performed by developing a HV reference. Details can be found in:F. D. Hernandez, F. Ibanez, S. Gutierrez and W. Martinez, “Improvements on signal-to-noise ratio in feedback measurement in DC/DC converters,” 2020 22nd European Conference on Power Electronics and Applications (EPE’20 ECCE Europe), 2020, pp. 1-10, doi: 10.23919/EPE20ECCEEurope43536.2020.9215774.|
|Prof. Ibanez has been working in hybrid storage systems by combining supercapacitors and batteries using DC/DC converters. The selected topology is called semi-active hybrid storage system where only one energy storage device is under control. Prof. Ibanez has focused his studies in the control of the battery current in order to improve the performance of the storage system, while the supercapacitors deliver high power pulses. Details of his research can be found in:F. M. Ibanez, A. M. Beizama Florez, S. Gutiérrez and J. M. Echeverrría, “Extending the Autonomy of a Battery for Electric Motorcycles,” in IEEE Transactions on Vehicular Technology, vol. 68, no. 4, pp. 3294-3305, April 2019, doi: 10.1109/TVT.2019.2896901.|
|Prof. Ibanez has beed developing a bidirectional inverter using resonant techniques. It combines a resonant dual active bridge with a single phase inverter in order to avoid the inverter stage in an energy storage system.The results and details are published in:F. M. Ibanez, “Bidirectional Series Resonant DC/AC Converter for Energy Storage Systems,” in IEEE Transactions on Power Electronics, vol. 34, no. 4, pp. 3429-3444, April 2019, doi: 10.1109/TPEL.2018.2854924.|