André Andreta

🎉 Excited to share that our new paper, “Auto-Tuning of Adaptive Control Initial Gains Using Virtual System-Based Approach in Grid-Tied Converters”, has just been published in Revista Eletrônica de Potência (SOBRAEP Journal of Power Electronics) ⚡😎😎 ⚙In this work, we propose and experimentally validate a virtual system-based auto-tuning method for initializing the gains of adaptive controllers applied to grid-tied converters. This approach provides a practical and systematic alternative to empirical tuning. 🗝 Key contributions include: ✏A virtual-plant auto-tuning approach that ensures persistent excitation and smooth transition to the physical plant; ✏Full adaptive RMRAC–FASTSM implementation, achieving robust performance under load and parametric variations; ✏Experimental validation demonstrating reduced transients, lower residual tracking errors, and THD within IEEE-1547 limits. This methodology can be extended to any adaptive control structure requiring initial gain tuning, offering a solid foundation for real-world adaptive systems deployment. I’m deeply grateful to my co-authors and colleagues for their collaboration and support throughout this research. 🙏 📘 The full paper is available at: https://lnkd.in/dU9ZQj_f 💭"The understanding does not take its laws from nature, but gives them to it.!"💭, Immanuel Kant, Critique of Pure Reason. #Onlinetuning #Virtualsystem #Automatictuning #Slidingmodecontrol #Adaptivecontrol #Gridtiedconverters #Voltagesourceinverters #UFSM #GEPOC

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Our work on demonstrating Stochastic resonance in ferroelectric (bistable) systems is out in Small: https://lnkd.in/gtNrVzaB I am particularly proud of this robust work lead from the front by Vivek Dey, with highest quality implementation by Vivek Dey Thejas Basavarajappa (as his masters thesis) and army of amazing undergrads at @IIT Palakkad Manikantan R S Kevin Jacob Jonnalagadda Nikhila. (Kevin and Nikhila are currently pursuing PhD in IISc, Thejas is in Cornell for PhD, and Mani in Texas Instruments). Ofcourse, all this is a very nice and fruitful collaboration with my good friend (and a senior from IITM days) Arvind Ajoy. The backstory will be a long blogpost for some other time. SR is a phenomena by which one can take help from noise (white in this case) to switch from polarization up to polarization down and back in a ferroelectric material at sub-coercive fields. If the rate of escape from a single well (which is modulated by noise) matches with the input frequency, we have "resonance" or stochastic resonance. While I recommend you all to read the paper to see how our predictive modeling, design of experiements, and the experimental results are in perfect sync, here are some highlights of this paper: 1. Generally SR is shown in (volatile) devices through some metrics. But we show a direct measurement of Kramers escape time (which is a direct measurement of SR) in ferroelectric (non-volatile) devices. Kramers escape time is well defined quantity in chemical reactions (and physical chemistry). To put it in context of FE double wells and non-volatile devices in general is Arvind Ajoy genius. 2. Our formulation lets us estimate the friction coefficient for domain switching in PZT. 3. Importantly, we show that a few independent figures of merit such as cross covariance with a polarization switching signal, SNR, and output power do actually show a peak at SR (defined by Kramers escape time problem). 4. Showing these ideas experimentally requires huge amount statistical sampling (at various generated noise) and ensemble averaging. I was joking with Vivek that these in itself will be great (and much more demanding) endurance tests for FE devices. Not all FEs can withstand this. Add to that some cycling induced imprint effects. That justifies the use of PZT (a model'ish' system). From now on, I am going to say one has a good FE material if one shows SR in them with the statistical rigour shown here. 5. There is some fun in doing predictive modeling, and seeing that your robust experiments actually match the predictions. With the amount of complexity in the materials systems we work on, this is typically a rarity. Happy reading !

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Current source inverters have significant advantages over voltage source inverters for motor drives, such as smoother output current waveforms and lower dv/dt. However, one significant disadvantage of current source inverters is the need for a large, lossy DC-link inductor. Could we mitigate this disadvantage by using the field winding of a wound-field synchronous motor as the DC-link inductor for its own current source inverter motor drive? Answering this question led to a paper that was recently accepted by IEEE JESTPE. In this paper, my coauthors, Sri Vignesh Sankarraman and Salek Khan, PhD, and I compared different topologies of wound-field synchronous motors, selected a design for further evaluation, and concluded that the field winding can indeed provide plenty of inductance for DC-link of the current-source inverter. Finally, we built and tested a technology demonstrator to validate our conclusions. The authors' version of the paper is freely available on our lab website: https://lnkd.in/gqazZGqX.

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✨ New Publication on IEEE Xplore ✨ I’m pleased to share that our paper, “Complementing Hydroelectric Power with Batteries for the Spanish Electric System,” is now available on IEEE Xplore. 🔗 Read the paper: https://lnkd.in/eVH5ddaG As Spain moves toward large-scale integration of renewables, a key challenge is not just adding more capacity but ensuring reliability, flexibility, and security of supply, especially during dry hydrological years. In this work, we analyse how Battery Energy Storage Systems (BESS) can effectively complement hydropower to support the integration of 42.5 GW of solar PV and wind into the Spanish electric system. Using 10-minute-resolution data over 2 years, we evaluate different operational scenarios and storage strategies. This study highlights the importance of combined storage strategies for future high-renewable power systems and provides practical insights for system planners and policymakers. Grateful to my co-authors, Julio Pascual Miqueleiz and Luis Marroyo, for the collaboration. #EnergyStorage #Hydropower #Batteries #RenewableEnergy #PowerSystems #Decarbonization #IEEE #SpainEnergy

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