13/12/2017 - Weekly Seminars

The research group has started a new season of internal seminars related to the different topics where the researchers are involved, to share with the rest of the group. Below is the list of seminars is exposed:

  1. LCL filter design method for three-phase grid connected to improve stability (29/09/2016).
  2. Optimal Control of switched reluctance machine applying Pontryagin’s principle to minimize torque ripple (14/10/2016).
  3. EMI/EMC design and troubleshooting overview (26/10/2016).
  4. Control strategy for grid converters under three-phase unbalance loads conditions (11/11/2016).
  5. Overview Modbus Communication: Principles and Implementation example (18/11/2016).
  6. LC Filter Design for Interleaved DC/DC converter connected to charge/discharge a module of ultracapacitors (24/11/2016).
  7. Optimal Direct Power Control of Grid Connected DC/AC Converters to improve dynamic response and applications (25/11/2016).
  8. Extraction of ocean-wave energy: Introductory aspects (15/01/2017).
  9. Experimental Frequency response of 3000F 2.7V. Maxwell ultracapacitors cells and equivalent circuit (24/02/2017).
  10. Application of Parallel for-Loops (parfor) of MATLAB in Linear Switched Reluctance Machine (LSRM) and DC/DC converter design (03/03/2017).
  11. How to handle our time well (03/04/2017).
  12. Li-ion Supercaps (17/04/2017).
  13. Active Damping of LCL-filter Based Grid-tie Inverters (05/05/2017).
  14. Wave Energy Converter SIMulator (23/06/2017).
  15. Modeling and control of the half bridge power converter using matlab (06/07/2017).
  16. Sizing of converters and calculation of losses in SRM (18/09/2017).
  17. Brainstorming imbalance of UCs and conclusions from the variation of self-discharge, esr and c with respect to the value given by the manufacturer (19/09/2017).
  18. Sizing of converter for reluctance machines (25/09/2017).
  19. Steps to take and things to keep in mind in purchases and suppliers for each type of material  (25/09/2017).
  20. Alarms and protocols of action in the control of the loading / unloading of UCs (16/10/2017).
  21. Modeling of the UC BCAP3000 according to their frequency response, measured experimentally (20/10/2017).
  22. Thermal loss model in SEMIKRON modules (27/10/2017).
  23. CC Characterization for each UC used in prototypes 00 and 01 of SH2 project.
  24. Self-discharge analysis in supercapacitors Maxwell BCAP3000.

31/12/2017 - End of the UNDIGEN MAS project

Buoy developed in the UNDIGEN project

The CIEMAT ends the project UNDIGEN MAS (Autonomous Marine System), corresponding to the call Challenges Collaboration of the Ministry of Economy, Industry and Competitiveness 2014. The project has developed an energy storage system, based on supercapacitor technology, for its integration into the measurement, surveillance and communication systems of the marine environment installed on autonomous buoys that work with wave energy (wave energy).

The CIEMAT, and in particular the Electric Power Systems Unit, which already has an important trajectory in the conversion of wave energy into electrical energy since 2011, having participated in projects such as UNDIGEN, BRAKING WEDGE, ATLANTIC POWER CLUSTER, SMARTWEC and UNDIGEN MAS. During these projects, technologies and methodologies have been developed related to the generation and storage of energy associated with oceanic energies and their integration into electricity networks, specifically the devices called point absorbers. This has significantly increased the capabilities of CIEMAT in the field of renewable energy, one of the hallmarks of the house.

Specifically, the UNDIGEN MAS project (RTC-2014-2156-3), of the Call for Collaboration Challenges of the Ministry of Economy 2014, Industry and Competitiveness (MINECO), was endowed with € 430k for the adaptation of the prototype of the energetic generation developed during the UNDIGEN project, so that it can provide a supply to meteo-oceanic measurement systems, marine monitoring and communication systems installed in autonomous buoys, providing it with a storage system that allows the management of the generated energy. In this project have participated, in addition to the CIEMAT, the companies WEDGE GLOBAL S.L and SAES S.A., as well as the Oceanic Platform of the Canary Islands (PLOCAN).

Laboratory test bench

The Unit has participated in the UNDIGEN MAS project developing the design of the energy storage system, as well as its control strategy, which is necessary to ensure a constant supply of power to the equipment shipped in the measuring buoy, and to achieve the conditioning of the oscillating and irregular power that comes from the waves and that serves as an electrical supply for said equipment.

Furthermore, the CIEMAT has carried out an important stage of tests in the laboratory during the project, where a multipurpose test bench has been developed that is able to operate, on the one hand, the power supply that comes from the energy collector of the surf and, on the other hand, the load corresponding to the measurement equipment, including the storage system that operates with its corresponding control strategies. As a prototype of the energy storage system, a device has been developed based on 60 individual supercapacitor cells of 2.7 V and 3000 F each one, implementing a commercial equalization system and developing an individual monitoring system for each of the cells . The supercapacitors are a very suitable technology for this application that have high power density and they are adequate for high power and low energy levels, coinciding with what is required in this case.

Summary graph of results obtained in the UNDIGEN MAS project

The tests have allowed to emulate in a controlled work environment the different situations that can occur in the real system, with other sea states and different load configurations, also validating the design of the storage system, as well as its control strategies. This is a very important previous step to the installation of the system in the final device for its implementation that saves many hours of work and economic cost.

This test bench has an important utility for subsequent developments related to the integration in red of a generation of electrical energy with renewable energies and with the analysis of energy storage systems.

02/10/2017 - Course: Principles of Energy Storage

Celebrated in Madrid (Spain) from 2nd to 6th October 2017 coordinated by Mirian Bravo Taranilla (CIEMAT) and directed by Marcos Lafoz (CIEMAT). This course review the different existing technologies, their present situation and their particular applications, either from a theoretical and a practical approach with demonstrations at the laboratory and examples with a simulation tool for a better understanding of their fundamentals and operation, which provides a distinguishing character to the course. Grid connection schemes and potential effects in it are also analysed. Furthermore, the course is also complemented with an introduction to environmental and safety issues. Main factors, which affect their development and implementation such as regulatory, market and environmental aspects, will be finally considered.

22/03/2017 - EWTEC 2017 Conference

CIEMAT participated in the Twelfth European  Wave and Tidal Energy Conference (EWTEC 2017) celebrated in Cork (Ireland) between 27th August and 1st September 2017. It reuned more than 500 experts in the field of renewable energy who presented more than 450 research papers. This congress is one of the most important in the field of marine energy and covers multidisciplinary aspects of wave energy and marine currents ranging from hydrodynamic studies of devices to their impact on the quality of the electricity network through socio-economic analysis of these renewable energies. This unit presented two works, “Study of the impact of wave energy generation in the frequency of an island electric grid” by Marcos Blanco and "Reduction of power oscillations combining energy storage with prediction techniques" by Marcos Lafoz.

22/03/2017 - Workshop on hybrid energy and energy storage systems

Celebrated in San Sebastian (Spain) in March 22nd 2017 under the umbrella of EERA, it was celebrated workshop to identify the potential characteristics as well as main barriers and challenges of the use of energy storage and hybrid energy storage for the integration of renewables. The Unit of Electric Power System introduced the Workshop with the topic “Hybridisation with fast energy storage systems”, presented by Marcos Lafoz. Supported by IK4-CIDETEC and TECNALIA, the workshop hosted around 50 participants and presenters from CIEMAT, SINTEF, UPM, SCHWUNGRAD, NTNU, UNIPD and EUROBAT.
A complete report will be prepared based on the notes compiled from the workshop in order to write a white paper with the main conclusions and recommendations obtained from the workshop.

8/03/2017 - Barbecue to celebrate the presentation of CHRISTIE project and the success of the last group of students with the TFG

Due to the arriving of the spring time, the last success in the preparation of project proposals and the end of the final degree projects carried out by the students from the UPM, a “community lunch” has been celebrated using our brand new barbecue, where different types of meats and vegetables have been cooked. 

01/03/2017 - Project SMARTWEC

The Unit of Electric Power Systems has been subcontracted to participate in the project SMARTWEC, a project funded by the Regional Government of Cantabria, where the group will develop a set of models based on NEMOH and WECSIM as well as optimised solution of WEC to be installed in Cantabrian Sea. The project is leaded by WedgeGlobal. 

08/01/2017 - Project with DEHLSEN

A new project based on wave energy generation has been started with the American company DEHLSEN, funded by the DOE. In this case, a complete design of the power electronics converter and control to supply a new power take-off to be used in a wave converter, will be faced. In case of being successful, the project will have a next stage for the manufacture and test of the equipment. 

25/11/2016 - Workshop “Introduction to Ocean Energies”

The group has given an online workshop titled “Introduction to Ocean Energies”, through the Education Department of CIEMAT and the Foundation CEDDET. The course of 25 hours has been offered to students from Latin American countries. A total of 30 people has been followed the course and it has consisted in a set of 6 units to be followed and some exercises to be completed at the end of the unit.

26/10/2016 - Power tests with 200A silicon-carbide (SiC) MOSFETS in DC/DC applications

The research group is testing silicon-carbide (SiC) power modules in half bridge topology with fast recovery diodes in antiparallel. The main electric characteristics of the modules are: 600V, 200A and a maximum switching frequency of 200kHz. It is expected to get a comparison with conventional silicon devices in order to determine the thermal advantages with respect to the classical solution. This technology has interesting potential applications in electric vehicles, aircrafts and particle accelerators. 


24/10/2016 - Laboratory test bench based on 2.7V and 3000F ultracapacitors modules

The work is related to the project SH2 in collaboration with GAMESA, where the group develops an important rule related to the prototypes and design. The laboratory test bench consists of an AC/DC converter connected to the electric grid and a DC/DC converter (3 phases in interleaving) connected between the previous converter and the module of ultracapacitors. The first converter regulates the voltage in the continuos stage to 120Vdc and the DC/DC converter regulates the charge and discharge current in the ultracapacitors to 200Arms. The module presented in the picture comprises 30 ultracapacitors connected in series with charge and discharge cycles at maximum continuous current.

20/09/2016 - The research group participate in the 18th Conference on Power Electronics and Applications EPE 2016

This conference celebrated in Karlsruhe (Germany) between 5 and 9 September brings together yearly experts in power electronics and electric drives areas intended for energy applications, transport and industrial processes. This research group participated with two papers. The first paper presented, "Design Methodology of a High Speed Switched Reluctance Generator Drive for Aircrafts" is related with the methodology for the optimized design of electric drives applied to More Electric Aircrafts (MEA) where the purpose is to replace the hydraulic actuators by electric actuators. The second paper presented “Minimum Losses Point Tracking and Minimum Current Point Tracking in Interior PMSMs” is related with optimization strategies to drive electric motors. In this case, a comparative study is done about different control strategies in interior permanent magnets synchronous motors for electric vehicle applications.