Nonlinear control systems group
TalTech priority area
Research classification (Frascati)
Head of the research group
Research group member
Doctoral students
Keyword
non-linear control systems
autonomous vehicles
power systems
algebraic methods
Overview
The group is a leading Estonian research unit inautomatic control, focusing on nonlinear controlsystems, including also hybrid and time-delaysystems. The group has made a significantcontribution to the development of constructivealgebraic methods and the associated symbolicsoftware package NLControl, which supportsresearch, teaching and applications.A universal algebraic methodology has beendeveloped that simplifies the study of very different problems for nonlinear control systems fromunified perspective. The main idea is to constructsequences of subspaces (or submodules) of differential 1-forms that provide a lot of informationabout the structural properties of the system. Forinstance, an event-based resource-aware controlmethod based on the concept of differential flatness has been developed.Although the group is developing predominantlyapplication-independent general methods, theapplicability of which depends rather on thedynamic properties of mathematical models, we have recently focused on some carefully selectedapplications, some of which are addressed withinthe joint topics of the Estonian Centre for Excellence in Science (EXCITE), our group is part of.These include control of autonomous underwater vehicles and ionic polymer-metal compositeactuators. Within the last few years, specialattention has been paid to the study of practicalproblems arising in the limits of renewable energy integration, and determineing the possiblelimitations of distributed energy storage devicesin low inertia power systems utilizing methodsfrom optimal control theory.
Related projects
Related department
- Meas, M., Machlev, R., Kose, A., Tepljakov, A., Loo, L., Levron, Y., Petlenkov, E., Belikov, J. Explainability and transparency of classifiers for air-handling unit faults using explainable artificial intelligence (XAI) // Sensors (2022) vol. 22, issue 17, art. 6338 : ill.
https://doi.org/10.3390/s22176338 - Zargari, N., Ofir, R., Chowdhury, N.R., Belikov, J., Levron, Y. An optimal control method for storage systems with ramp constraints, based on an on-going trimming process // IEEE Transactions on Control Systems Technology (2023) vol. 31, 1, p. 493-496.
https://doi.org/10.1109/TCST.2022.3169906 - Sarafrazi, M.A., Kotta, Ü., Bartosiewicz, Z. On the stopping criteria in nonlinear unknown input observability condition // IEEE transactions on automatic control (2022) vol. 67, 9, p. 4733-4737.
https://doi.org/10.1109/TAC.2022.3160133 - Machlev, R., Perl, M., Belikov, J., Levy, K., Levron, Y. Measuring explainability and trustworthiness of power quality disturbances classifiers using XAI - explainable artificial intelligence // IEEE transactions on industrial informatics (2022) vol. 18, 8, p. 5127−5137.
https://doi.org/10.1109/TII.2021.3126111 - Onile, A. E., Machlev, R., Petlenkov, E., Levron, Y., Belikov, J. Uses of the digital twins concept for energy services, intelligent recommendation systems, and demand side management : a review // Energy reports (2021) vol. 7, p. 997−1015.
https://doi.org/10.1016/j.egyr.2021.01.090 - Bartosiewicz, Z., Kaldmäe, A., Kawano, Y., Kotta, Ü., Pawluszewicz, E., Simha, A., Wyrwas, M. Accessibility and system reduction of nonlinear time-delay control systems // IEEE Transactions on Automatic Control (2021) Vol. 66, 8, p. 3781−3788.
https://doi.org/10.1109/TAC.2020.3028566 - Machlev, R., Heistrene, L., Perl, M., Levy, K. Y., Belikov, J., Mannor, S., Levron, Y. Explainable Artificial Intelligence (XAI) techniques for energy and power systems : review, challenges and opportunities // Energy and AI (2022) vol. 9, art. 100169, 13 p. : ill.
https://doi.org/10.1016/j.egyai.2022.100169 - Navon, A., Machlev, R., Carmon, D., Onile, A. E., Belikov, J., Levron, Y. Effects of the COVID-19 pandemic on energy systems and electric power grids — a review of the challenges ahead // Energies (2021) vol. 14, 4, art. 1056, 14 p. : ill.
https://doi.org/10.3390/en14041056 - Carmon, D., Navon, A., Machlev, R., Belikov, J., Levron, Y. Readiness of small energy markets and electric power grids to global health crises: Lessons from the COVID-19 pandemic // IEEE Access (2020) vol. 8, art. 9139437, p. 127234−127243.
https://doi.org/10.1109/ACCESS.2020.3008929 - Machlev, R.; Zargari, N.; Chowdhury, N. R.; Belikov, J.; Levron, Y. A review of optimal control methods for energy storage systems - energy trading, energy balancing and electric vehicles // Journal of energy storage (2020) vol. 32, art. 101787, 16 p.
https://doi.org/10.1016/j.est.2020.101787 - Machlev, R., Chachkes, A., Belikov, J., Beck, Y., Levron, Y. Open source dataset generator for power quality disturbances with deep-learning reference classifiers // Electric power systems research (2021) vol. 195, art. 107152, 7 p. : ill.
https://doi.org/10.1016/j.epsr.2021.107152 - Škiparev, V., Machlev, R., Chowdhury, N.R., Levron, Y., Petlenkov, E., Belikov, J. Virtual inertia control methods in islanded microgrids // Energies (2021) vol. 14, 6, art. 1562, 20 p. : ill.
https://doi.org/10.3390/en14061562 - Chowdhury, N.R., Belikov, J., Baimel, D., Levron, Y. Observer-based detection and identification of sensor attacks in networked CPSs // Automatica (2020) vol. 121, art. 109166, 13 p.
https://doi.org/10.1016/j.automatica.2020.109166 - Navon, A., Yosef, G.B., Machlev, R., Belikov, J. et al. Applications of game theory to design and operation of modern power systems: a comprehensive review // Energies (2020) vol. 13, 15, art. 3982, 34 p.
https://doi.org/10.3390/en13153982 - Škiparev, V., Belikov, J., Petlenkov, E. Reinforcement learning based approach for virtual inertia control in microgrids with renewable energy sources // Proceedings of 2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), 26-28 October, 2020. Danvers : IEEE, 2020. p. 1020-1024.
https://doi.org/10.1109/ISGT-Europe47291.2020.9248777 - Chowdhury, N. R., Ofir, R., Zargari, N., Baimel, D., Belikov, J., Levron, Y. Optimal control of Lossy energy storage systems with nonlinear efficiency based on dynamic programming and Pontryagin's minimum principle // IEEE transactions on energy conversion (2021) vol. 36, 1, p. 524-533.
https://doi.org/10.1109/TEC.2020.3004191 - Meurer, C., Francisco Fuentes-Perez, J., Palomeras, N., Carreras, M., Kruusmaa, M. Differential pressure sensor speedometer for autonomous underwater vehicle velocity estimation // IEEE Journal of Oceanic Engineering (2020) Vol. 45, Issue 3, p. 946 - 978.
https://doi.org/10.1109/JOE.2019.2907822 - Baimel, D., Chowdhury, N., Belikov, J., Levron, Y. New type of bridge fault current limiter with reduced power losses for transient stability improvement of DFIG wind farm // Electric Power Systems Research (2021) vol. 197, art. 107293, 8 p. : ill.
https://doi.org/10.1016/j.epsr.2021.107293 - Simha, A., Gkliva, R., Kotta, Ü., Kruusmaa, M. A flapped paddle-fin for improving underwater propulsive efficiency of oscillatory actuation // IEEE robotics and automation letters (2020) vol. 5, 2, p. 3176-3181.
https://doi.org/10.1109/LRA.2020.2975747 - Raj, N., Simha, A., Kothari, M. et al. Iterative Learning based feedforward control for Transition of a Biplane-Quadrotor Tailsitter UAS // 2020 IEEE International Conference on Robotics and Automation (ICRA), 31 May-31 Aug. 2020, Paris, France : proceedings. Danvers : IEEE, 2020. p. 321-327 : ill.
https://doi.org/10.1109/ICRA40945.2020.9196671 - Alsaleh, S., Tepljakov, A., Köse, A., Belikov, J., Petlenkov, E. ReImagine lab : bridging the gap between hands-on, virtual and remote control engineering laboratories using digital twins and extended reality // IEEE Access (2022) Vol. 10, p. 89924-889943 : ill.
https://doi.org/10.1109/ACCESS.2022.3199371 - Aabloo, A., Belikov, J., Kaparin, V., Kotta, Ü. Challenges and perspectives in control of ionic polymer-metal composite (IPMC) actuators : a survey // IEEE Access (2021) vol. 8, art. 9133056, p. 121059-121073.
https://doi.org/10.1109/ACCESS.2020.3007020 - Machlev, R., Batushansky, Z., Soni, S., Belikov, J. et al. Verification of utility-scale solar photovoltaic plant models for dynamic studies of transmission networks // Energies (2020) vol. 13, 12, art. 3191, 20 p. : ill.
https://doi.org/10.3390/en13123191 - Meurer, C., Fuentes-Perez, J.F., Schwarzwalder, K., Kruusmaa, M. et al. 2D estimation of velocity relative to water and tidal currents based on differential pressure for autonomous underwater vehicles // IEEE robotics and automation letters (2020) vol. 5, 2, p. 3444−3451.
https://doi.org/10.1109/LRA.2020.2976318 - Ferrantelli, A., Belikov, J., Petlenkov, E., Thalfeldt, M., Kurnitski, J. Evaluating the energy readiness of national building stocks through benchmarking // IEEE Access (2022) Vol. 10, p. 45430-45443 : ill.
https://doi.org/10.1109/ACCESS.2022.3170716 - Ben Yosef, G., Navon, A., Poliak, O., Etzion, N., Gal, N., Belikov, J., Levron, Y. Frequency stability of the Israeli power grid with high penetration of renewable sources and energy storage systems // Energy reports (2021) vol. 7, p. 6148−6161 : ill.
https://doi.org/10.1016/j.egyr.2021.09.057 - Machlev, R., Chowdhury, N.R., Belikov, J., Levrov, Y. Distributed storage placement policy for minimizing frequency deviations: A combinatorial optimization approach based on enhanced cross-entropy method // International Journal of Electrical Power and Energy Systems (2022) Vol. 134, p. 1-14 : ill.
https://doi.org/10.1016/j.ijepes.2021.107332 - Vansovits, V., Petlenkov, E., Tepljakov, A., Vassiljeva, K., Belikov, J. Bridging the gap in technology transfer for advanced process control with industrial applications // Sensors (2022) vol. 22, 11, art. 4149.
https://doi.org/10.3390/s22114149 - Mullari, T., Kotta, Ü. Linearization of discrete-time control system by state transformation // Proceedings of the Estonian Academy of Sciences (2021) vol. 70, 1, p. 62–79.
https://doi.org/10.3176/proc.2021.1.09 https://kirj.ee/wp-content/plugins/kirj/pub/proc-1-2021-62-79_20210630094644.pdf?v=a57b8491d1d8 - Carravetta, F., Sarafrazi, M.A., Bartosiewicz, Z., Kötta, Ü. A test for the generic strong-accessibility of meromorphic nonlinear systems // IEEE transactions on automatic control (2020) vol. 65, 2, p. 867-873.
https://doi.org/10.1109/TAC.2019.2921645 - Levron, Y., Belikov, J. Control of energy storage devices under uncertainty using nonlinear feedback systems // 2020 IEEE Power & Energy Society General Meeting : (PESGM 2020)
Montreal, Quebec, Canada, 2-6 August 2020 : proceedings. Danvers : IEEE, 2020. p. 95-99.
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9281879 - Mullari, T., Kotta, Ü. Transformation of nonlinear discrete-time state equations into the observer form : extension to non-reversible case // Proceedings of the Estonian Academy of Sciences (2021) 3, p. 235-247.
https://doi.org/10.3176/proc.2021.3.03 - Kaldmäe, A., Kotta, Ü. Comments on 'A new kind of nonlinear disturbance observer for nonlinear systemswith applications to cruise control of air-breathing hypersonic vehicles' // International journal of control (2020) vol. 93, 7, p. 1725.
https://doi.org/10.1080/00207179.2018.1529436 - Spichakova, M., Haav, H-M. Using machine learning for automated assessment of misclassification of goods for fraud detection // Databases and Information Systems : 14th International Baltic Conference, DB&IS 2020, Tallinn, Estonia, June 16-19, 2020 : Proceedings. Cham : Springer, 2020. p. 144-158. (Communications in computer and information science ; 1243).
https://doi.org/10.1007/978-3-030-57672-1_12 - Zargari, N., Ofir, R., Levron, Y, Belikov, J. Using DQ0 signals based on the central angle reference frame to Model the dynamics of large-scale power systems // Proceedings of 2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), 26-28 October, 2020. Danvers : IEEE, 2020. p. 1099-1103.
https://doi.org/10.1109/ISGT-Europe47291.2020.9248812 - Mullari, T., Kotta, Ü., Bartosiewicz, Z. et al. Weak reachability and controllability of discrete-time nonlinear systems: generic approach and singular points // International journal of control (2020) vol. 93, 3, p. 483-489.
https://doi.org/10.1080/00207179.2018.1479076 - Škiparev, V., Belikov, J., Petlenkov, E. MIMO reinforcement learning based approach for frequency support in microgrids with high renewable energy penetration // 2021 IEEE Power & Energy Society General Meeting (PESGM), 26-29 July 2021. : IEEE, 2021. 5 p. : ill.
https://doi.org/10.1109/PESGM46819.2021.9637942 - Mystkowski, A., Kierdelewicz, A., Kotta, Ü., Kaparin, V. Experimental validation of the Newton observer for a nonlinear flux-controlled AMB system operated with zero-bias flux // International journal of control (2020) vol. 93, 9, p. 2257-2266 : ill.
https://doi.org/10.1080/00207179.2018.1552025 - Spichakova, M., Haav, H-M. Application of machine learning for assessment of HS code correctness // Baltic journal of modern computing (2020) vol. 8, 4, p. 698-718.
https://doi.org/10.22364/bjmc.2020.8.4.13 - Machlev, R., Malka, A., Perl, M., Levron, Y., Belikov, J. Explaining the decisions of deep learning models for load disaggregation (NILM) based on XAI // 2022 IEEE Power & Energy Society General Meeting (PESGM). Washington : IEEE Computer Society, 2022. art. 183865 , p. 1-5 : ill.
https://doi.org/10.1109/PESGM48719.2022.9917049 - Sarafrazi, M.A., Pawłuszewicz, E., Bartosiewicz, Z., Kotta, Ü. On the finiteness of accessibility test for nonlinear discrete-time systems // International journal of control (2021) vol. 94, 9, p. 2330-2336.
https://doi.org/10.1080/00207179.2019.1706102 - Sinimaa, M., Spichakova, M., Belikov, J., Petlenkov, E. Feature engineering of Weather Data for Short-Term Energy Consumption Forecast // 2021 IEEE Madrid PowerTech. : IEEE, 2021. 6 p..
https://doi.org/10.1109/PowerTech46648.2021.9494920 - Nosrati, K., Tepljakov, A., Petlenkov, E., Levron, Y., Škiparev, V., Belikov, J. Coordinated PI-based frequency deviation control of isolated hybrid microgrid : an online multi-agent tuning approach via reinforcement learning // 2022 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) : proceedings. Washington : IEEE Computer Society, 2022. p. 1-5 : ill.
https://doi.org/10.1109/ISGT-Europe54678.2022.9960311 - Onile, A. E., Belikov, J., Petlenkov, E., Levron, Y. A comparative study on graph-based ranking algorithms for consumer-oriented demand side management // 2021 IEEE Madrid PowerTech. : IEEE, 2021. 6 p.
https://doi.org/10.1109/PowerTech46648.2021.9494752 - Škiparev, V., Belikov, J., Petlenkov, E., Levron, Y. Reinforcement learning based MIMO controller for virtual inertia control in isolated microgrids // 2022 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) : proceedings. : IEEE, 2022. art. 184786, 5 p. : ill.
https://doi.org/10.1109/ISGT-Europe54678.2022.9960447 - Onile, A.E., Belikov, J., Levron, Y. Innovative energy services for behavioral-reflective attributes and intelligent recommender system // Proceedings of 2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), 26-28 October, 2020. Danvers : IEEE, 2020. p. 242-246.
https://doi.org/10.1109/ISGT-Europe47291.2020.9248810 - Burzynski, P., Simha, A., Kotta, Ü., Pawluszewicz, E., Sastry, S. FLHex: a flapped-paddle hexapod for all-terrain amphibious locomotion // Bulletin of the Polish Academy of Sciences Technical Sciences (2021) vol. 69, 6, art. e139007, 9 p. : ill.
https://doi.org/10.24425/bpasts.2021.139007 - Mullari, T., Kotta, Ü. Feedback linearization of discrete-time nonlinear control systems : computational aspects // Proceedings of the Estonian Academy of Sciences (2020) vol. 69, 1, p. 11-26.
https://doi.org/10.3176/proc.2020.1.03 http://kirj.ee/32996/?tpl=1061&c_tpl=1064 - Sarafrazi, M.A., Bartosiewicz, Z., Kotta, Ü. Comments on "PBH tests for nonlinear systems" // Automatica (2020) vol. 111, art. 108617.
https://doi.org/10.1016/j.automatica.2019.108617 - Gal, N., Navon, A., Ben Yosef, G., Levron, Y., Belikov, J. Storage for grid deferral : the case of Israel // 2021 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), 8-21 October, 2021 : proceedings. Danvers : IEEE, 2021. 5 p.
https://doi.org/10.1109/ISGTEurope52324.2021.9639938 - Belikov, J., Meas, M., Machlev, R., Kose, A., Tepljakov, A., Loo, L., Petlenkov, E., Levron, Y. Explainable AI based fault detection and diagnosis system for air handling units // Proceedings of the 19th International Conference on Informatics in Control, Automation and Robotics - ICINCO, 2022 , Lisbon, Portugal. : SciTePress, 2022. p. 271-279.
https://doi.org/10.5220/0011350000003271 - Sarafrazi, M.A., Kotta, Ü., Bartosiewicz, Z. Finite determination of accessibility and singular points of nonlinear systems: an algebraic approach // Systems & control letters (2020) vol. 136, art. 104600, p. 1−7.
https://doi.org/10.1016/j.sysconle.2019.104600 - Chowdhury, N. R., Baimel, D., Belikov, J., Levron, Y. Construction of nonlinear feedback strategies for energy storage systems : a stochastic dynamic programming approach // 2021 IEEE Madrid PowerTech. : IEEE, 2021. 6 l.
https://doi.org/10.1109/PowerTech46648.2021.9494819 - Simha, A., Kotta, Ü. A geometric approach to position tracking control of a nonholonomic planar rigid body : case study of an underwater vehicle // Proceedings of the Estonian Academy of Sciences (2020) vol. 69, 3, p. 215-227 : ill.
https://doi.org/10.3176/proc.2020.3.05 https://kirj.ee/public/proceedings_pdf/2020/issue_3/proc-2020-3-215-227.pdf - Kaldmäe, A. Kaparin, V., Kotta, Ü., Mullari, T., Pawluszewicz, E. On the properties of forward and backward shifts of vector fields // Proceedings of the Estonian Academy of Sciences (2022) vol. 71, 4, p. 314-325.
https://doi.org/10.3176/proc.2022.4.02 - Kaldmäe, A. Algebraic necessary and sufficient condition for difference flatness // International Journal of Control (2021) vol. 98, 8 p.
https://doi.org/10.1080/00207179.2021.1908598 - Uudeberg, T., Päeske, L., Põld, T., Lass, J., Hinrikus, H., Bachmann, M. Long-term stability of EEG spectral asymmetry index - preliminary study // XV Mediterranean Conference on Medical and Biological Engineering and Computing - MEDICON 2019 : proceedings of MEDICON 2019, September 26–28, 2019, Coimbra, Portugal. Cham : Springer, 2020. p. 276-281. (IFMBE proceedings ; 76).
https://doi.org/10.1007/978-3-030-31635-8_33 - Navon, A., Orda, A., Levron, Y., Belikov, J. Effects of economic shocks on power systems: {COVID-19} as a case study // 2021 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), 8-21 October, 2021 : proceedings. Danvers : IEEE, 2021. 5 p. : ill.
https://doi.org/10.1109/ISGTEurope52324.2021.9640021 - Nosrati, K., Belikov, J., Tepljakov, A., Petlenkov, E. Image encryption using fractional singular chaotic systems : an extended Kalman filtering approach // 2022 International Conference on Electrical, Computer and Energy Technologies (ICECET). Washington : IEEE, 2022. 6 p. : ill.
https://doi.org/10.1109/ICECET55527.2022.9873484 - Raj, N., Colombo, L.J., Simha, A. Structure preserving reduced attitude control of gyroscopes // Automatica (2021) vol. 125, art. 109471, 7 p. : ill.
https://doi.org/10.1016/j.automatica.2020.109471 - Pilt, K., Karai, D., Bachmann, M., Gavriljuk, M., Allik, A., Uudeberg, T. Influence of mental stress on the arterial stiffness parameters detected from photoplethysmographic signal waveform // 2022 18th Biennial Baltic Electronics Conference (BEC). : IEEE, 2022. 4 p.
https://doi.org/10.1109/BEC56180.2022.9935609 - Ofir, R., Zargari, N., Belikov, J., Levron, Y. Minimal output impedance required for stability of grid-supporting inverters // IEEE transactions on power delivery (2021) vol. 36, 4, p. 2241-2244.
https://doi.org/10.1109/TPWRD.2021.3071023 - Kaldmäe, A., Kawano, Y., Kotta, Ü. Realizations in feedforward forms of nonlinear input-output equations with time-delays // International journal of robust and nonlinear control (2020) vol. 30, 17, p. 7560-7573.
https://doi.org/10.1002/rnc.5194 - Kaldmäe, A., Kotta, Ü. A brief tutorial overview of disturbance observers for nonlinear systems : application to flatness-based control // Proceedings of the Estonian Academy of Sciences (2020) vol. 69, 1, p. 57-73 : ill.
https://doi.org/10.3176/proc.2020.1.07 http://www.kirj.ee/33035/?tpl=1061&c_tpl=1064 - Belikov, J., Kalda, J. Impact of COVID-19 pandemic on energy demand in Estonia // IEEE Power & Energy Society General Meeting (PESGM). : IEEE, 2022. 5 l..
https://doi.org/10.1109/PESGM48719.2022.9916825 - Hokmabad, H.N., Belikov, J., Husev, O., Vinnikov, D. State-of-the-art activity recognition and prediction techniques applicable to the home energy management system // 2022 IEEE 7th International Energy Conference (ENERGYCON). : IEEE, 2022. art. 181231 : ill.
https://doi.org/10.1109/ENERGYCON53164.2022.9830154 - Ofir, R., Zargari, N., Navon, A., Levron, Y., Belikov, J. Assessing energy generation and consumption patterns in times of crisis : COVID-19 as a case study // 2021 IEEE Madrid PowerTech. : IEEE, 2021. 6 l.
https://doi.org/10.1109/PowerTech46648.2021.9494753 - Carravetta, F., Sarafrazi, M.A., Bartosiewicz, Z., Kotta, Ü. Testing generic strong accessibility of nonlinear control systems via polynomial (quadratic) immersion // 61st IEEE Conference on Decision and Control, CDC 2022, Cancun, 6 December - 9 December 2022, proceedings. Piscataway, New Jersey : IEEE, 2022. p. 1841-1846.
https://doi.org/10.1109/CDC51059.2022.9992952 - Belikov, J., Köse, A., Petlenkov, E., Tepljakov, A., Loo, L. Impact of the COVID-19 pandemic on the energy use and performance in commercial buildings // 2022 45th International Conference on Telecommunications and Signal Processing, TSP 2022. Piscataway, New Jersey : IEEE, 2022. p. 187-191.
https://doi.org/10.1109/TSP55681.2022.9851384 - Kotta, Ü., Moog, C., Tõnso, M. Remarks on the realization of time-varying systems // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 3, p. 208-216.
http://www.kirj.ee/public/proceedings_pdf/2018/issue_3/proc-2018-3-207-216.pdf https://doi.org/10.3176/proc.2018.3.02 https://artiklid.elnet.ee/record=b2865180*est - Simha, A., Raha, S. A Riemannian geometric approach to output tracking for nonholonomic systems // IFAC-PapersOnLine (2019) vol. 52, 16, p. 144-149.
https://doi.org/10.1016/j.ifacol.2019.11.769 - Simha, A., Kotta, Ü. A linear filtering framework for nonlinear systems based on extended output injection // IFAC-PapersOnLine (2019) vol. 52, 16, p. 274-279.
https://doi.org/10.1016/j.ifacol.2019.11.791 - Bartosiewicz, Z., Kotta, Ü., Pawłuszewicz, E., Tõnso, M., Wyrwas, M. Popov form and the explicit equations of inverse systems // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 4, p. 432-355 : ill.
http://www.kirj.ee/public/proceedings_pdf/2018/issue_4/proc-2018-4-342-355.pdf https://doi.org/10.3176/proc.2018.4.04 - Škiparev, V., Belikov, J., Petlenkov, E. NN-SANARX model based control of a water tank system using embedded microcontroller Arduino // Proceedings of the 2019 10th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications : IDAACS'2019, 18-21 Sept. 2019. Danvers : IEEE, 2019. p. 372-377 : ill.
https://doi.org/10.1109/IDAACS47747.2019 - Kaldmäe, A., Kotta, Ü. Observer-based residual generation for nonlinear discrete-time systems // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 4, p. 325-336.
http://www.kirj.ee/public/proceedings_pdf/2018/issue_4/proc-2018-4-325-336.pdf https://doi.org/10.3176/proc.2018.4.01 https://artiklid.elnet.ee/record=b2868167*est - Bartosiewicz, Z., Pawluszewicz, E., Wyrwas, M., Kotta, Ü., Tõnso, M. The strong Popov form of nonlinear input–output equations // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 3, p. 193–206.
https://doi.org/10.3176/proc.2018.3.01 - Levron, Y., Kaparin, V., Belikov, J. Analyzing the dynamics and stability of DQ0 systems based on a Port-Hamiltonian approach // 2019 27th Mediterranean Conference on Control and Automation (MED). [S.l.] : IEEE, 2019. p. 410-415 : ill.
https://doi.org/10.1109/MED.2019.8798495 - Kaldmäe, A., Kotta, Ü., Meurer, C., Simha, A. Event-based control for differentially flat systems: application to autonomous underwater vehicle // IFAC-PapersOnLine (2019) vol. 52, 16, p. 180-185.
https://doi.org/10.1016/j.ifacol.2019.11.775 - Kaldmäe, A., Kotta, Ü. Realization of nonlinear input-output equations in controller canonical form // Kybernetika (2018) vol. 54, 4, p. 736-747.
https://doi.org/10.14736/kyb-2018-4-0736 - Haripriya, N., Kavitha, P., Srinivasan, S., Belikov, J. Evolutionary optimisation-based fractional order controller for web transport systems in process industries // International Journal of Advanced Intelligence Paradigms (2019) vol. 12, 3/4, p. 317-330.
http://doi.org/10.1504/IJAIP.2018.10006748 - Mystkowski, A., Kotta, Ü., Kaparin, V. Newton observer for a nonlinear flux-controlled AMB system // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 1, p. 61-72 : ill.
https://doi.org/10.3176/proc.2018.1.03 http://www.ester.ee/record=b2355998*est - Tepljakov, A., Petlenkov, E., Belikov, J. Grey box identification of fractional-order system models from frequency domain data // 41th International Conference on Telecommunications and Signal Processing : July 4-6, 2018, Athens, Greece : proceedings. : IEEE, 2018. p. 319-322 : ill.
https://doi.org/10.1109/TSP.2018.8441247 - Kotta, Ü., Belikov, J., Halas, M., Leibak, A. Degree of Dieudonne determinant defines the order of nonlinear system // International journal of control (2019) vol. 92, 3, p. 518-527.
https://doi.org/10.1080/00207179.2017.1361042 - Belikov, J., Levron, Y. Dynamic modeling and stability analysis of power networks using DQ0 transformations with a unified reference frame // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 4, p. 368-377 : ill.
http://www.kirj.ee/public/proceedings_pdf/2018/issue_4/proc-2018-4-368-377.pdf https://doi.org/10.3176/proc.2018.67.4.05 - Belikov, J., Kaldmäe, A., Levron, Y. An Extended flatness-based controller for permanent magnet synchronous machines incorporating an event-based mechanism // 2019 27th Mediterranean Conference on Control and Automation (MED). [S.l.] : IEEE, 2019. p. 416-421 : ill.
https://doi.org/10.1109/MED.2019.8798551 - Kaldmäe, A., Kotta, Ü., Tõnso, M. Realization of nonlinear time-delay input–output equations // IEEE Control Systems Letters (2018) vol. 2, 3, p. 369-374.
https://doi.org/10.1109/LCSYS.2018.2838456 - Spitšakova, M., Belikov, J., Nõu, K., Petlenkov, E. Feature engineering for short-term forecast of energy consumption // Proceedings of 2019 IEEE PES : Innovative Smart Grid Technologies Europe : (ISGT-Europe), Bucharest Romania, 29 September - 2 October, 2019. Danvers : IEEE, 2019. 5 p. : ill.
https://doi.org/10.1109/ISGTEurope.2019.8905698 - Bartosiewicz, Z., Belikov, J., Kotta, Ü., Wyrwas, M. State feedback linearization of nonlinear control systems on homogeneous time scales // Nonlinear analysis: hybrid systems (2019) vol. 31, p. 69-85.
https://doi.org/10.1016/j.nahs.2018.08.002 - Kaparin, V., Kotta, Ü. Transformation of nonlinear MIMO discrete-time systems into the extended observer form // Asian journal of control (2019) vol. 21, 5, p. 2208–2217 : ill.
https://doi.org/10.1002/asjc.1824 - Srinivasan, S., Saravanakumar, G., Subathra, B., Kotta, Ü. et al. Adaptive controller for networked control systems subjected to random communication delays // Soft computing applications : proceedings of the 7th International Workshop Soft Computing Applications (SOFA 2016). Vol. 1. Cham : Springer, 2018. p. 78-94. (Advances in intelligent systems and computing ; 633).
https://doi.org/10.1007/978-3-319-62521-8_8 - Simha, A., Respondek, W., Kaldmae, A., Kaparinl, V., Kotta, U. Intrinsic conditions for extended observer forms for nonlinear systems // 2018 IEEE Conference on Decision and Control (CDC), 17-19 Dec. 2018, 17-19 Dec. 2018 : proceedings. Piscataway : IEEE, 2018. p. 1373-1378.
https://doi.org/10.1109/CDC.2018.8619122 - Ambroziak, L., Simha, A., Pawluszewicz, E., Kotta, Ü. et al. Motor failure tolerant control system with self diagnostics for unmanned multirotors // 2019 24th International Conference on Methods and Models in Automation and Robotics (MMAR). [S.l.] : IEEE, 2019. p. 422–427 : ill.
https://doi.org/10.1109/MMAR.2019.8864726 - Kaldmäe, A., Kotta, Ü. Realization of time-delay systems // Automatica (2018) vol. 90, p. 317-320.
https://doi.org/10.1016/j.automatica.2018.01.001 - Zargari, N., Levron, Y., Belikov, Y. Optimal control of energy storage devices based on Pontryagin's minimum principle and the shortest path method // Proceedings of 2019 IEEE PES : Innovative Smart Grid Technologies Europe : (ISGT-Europe), Bucharest Romania, 29 September – 2 October, 2019. Danvers : IEEE, 2019. 5 p.
https://doi.org/10.1109/ISGTEurope.2019.8905748 - Fahima, A., Ofir, R., Levron, Y., Belikov, J. Minimal energy storage required for stability of low inertia distributed sources // 2018 5th IEEE International Energy Conference (ENERGYCON), Limassol, Cyprus, June 3-7, 2018 : proceedings. [S.l.] : IEEE, 2018. 5 p. : ill.
https://doi.org/10.1109/ENERGYCON.2018.8398775 - Kaldmäe, A., Kotta, Ü., Shumsky, A., Zhirabok, A. Disturbance decoupling in nonlinear hybrid systems // Nonlinear analysis : hybrid systems (2018) vol. 28, p. 42-53.
https://doi.org/10.1016/j.nahs.2017.11.001 - Soudari, M., Kaparin, V., Srinivasan, S., Seshadri, S., Kotta, Ü. Predictive smart thermostat controller for heating, ventilation, and air-conditioning systems // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 3, p. 291-299 : ill.
http://www.kirj.ee/public/proceedings_pdf/2018/issue_3/proc-2018-3-291-299.pdf https://doi.org/10.3176/proc.2018.3.11 - Kaparin, V., Kotta, Ü. Transformation of nonlinear discrete-time system into the extended observer form // International journal of control (2018) vol. 91, 4, p. 848-858.
https://doi.org/10.1080/00207179.2017.1294264 - Meurer, C., Simha, A., Kotta, Ü., Kruusmaa, M. Nonlinear orientation controller for a compliant robotic fish based on asymmetric actuation // 2019 International Conference on Robotics and Automation : ICRA 2019, Palais des Congres de Montreal, Canada, 20-24 May, 2019. Danvers : IEEE, 2019. Art. 8793892 ; p. 4688-4694.
https://doi.org/10.1109/ICRA.2019.8793892 - Belikov, J., Levron, Y. Integration of long transmission lines in large-scale DQ0 dynamic models // Electrical Engineering (2018) vol. 100, 2, p. 1219–1228.
https://doi.org/10.1007/s00202-017-0582-7 - Kotta, Ü., Moog, C.H., Tõnso, M. Minimal realizations of nonlinear systems // Automatica (2018) vol. 95, p. 207-212.
https://doi.org/10.1016/j.automatica.2018.05.007 - Belikov, J., Levron, Y. Uses and misuses of quasi-static time-varying phasor models in power systems // IEEE transactions on power delivery (2018) vol. 33, 6, p. 3263-3266.
https://doi.org/10.1109/TPWRD.2018.2852950 - Tepljakov, A., Vunder, V., Petlenkov, E., Kaparin, V., Belikov, J. et al. Fractional-order modeling and control of ionic polymer-metal composite actuator // Smart materials and structures (2019) vol. 28, 8, 12 p. : ill.
https://doi.org/10.1088/1361-665X/ab2c75 - Belikov, J., Levron, Y. A sparse minimal-order dynamic model of power networks based on DQ0 signals // IEEE transactions on power systems (2018) vol. 33, 1, p. 1059-1067 : ill.
https://doi.org/10.1109/TPWRS.2017.2702746 - Fuentes-Perez, J.F., Meurer, C., Tuhtan, J.A., Kruusmaa, M. Differential pressure sensors for underwater speedometry in variable velocity and acceleration conditions // IEEE Journal of Oceanic Engineering (2018) Vol. 43, 2, p. 418-426 : ill.
https://doi.org/10.1109/JOE.2017.2767786 - Tepljakov, A., Petlenkov, E., Belikov, J. FOMCON toolbox for modeling, design and implementation of fractional-order control systems // Handbook of fractional calculus with applications. Berlin, Boston : De Gruyter, 2019. p. 211–236. (Applications in control ; 6).
https://doi.org/10.1515/9783110571745 - Machlev, R., Belikov, J., Beck, Y., Levron, Y. MO-NILM: A multi-objective evolutionary algorithm for NILM classification // Energy and buildings (2019) vol. 199, p. 134-144.
https://doi.org/10.1016/j.enbuild.2019.06.046 - Levron, Y., Belikov, J., Baimel, D. A tutorial on dynamics and control of power systems with distributed and renewable energy sources based on the DQ0 transformation // Applied sciences (2018) vol. 8, 9, art. 1661, 48 p. : ill.
https://doi.org/10.3390/app8091661 - Baimel, D., Tapuchi, S, Levron, Y., Belikov, J. Improved fractional open circuit voltage MPPT methods for PV systems // Electronics (2019) vol. 8, 3, art. 321.
https://doi.org/10.3390/electronics8030321 - Akinyele, D., Belikov, J., Levron, Y. Challenges of microgrids in remote communities: a STEEP model application // Energies (2018) vol. 11, 2, art. 432, 35 p. : ill.
https://doi.org/10.3390/en11020432 - Kaldmäe, A., Bartosiewicz, Z., Kotta, Ü., Wyrwas, M. Minimal realizations of nonlinear time-delay systems // IEEE transactions on automatic control (2023) vol. 68, 11, p. 6766 - 6772.
https://doi.org/10.1109/TAC.2023.3240124 - Škiparev, V., Nosrati, K., Tepljakov, A., Petlenkov, E., Levron, Y., Belikov, J., Guerrero, J.M. Virtual inertia control of isolated microgrids using an NN-based VFOPID controller // IEEE Transactions on sustainable energy (2023) vol. 14, 3, p. 1558-1568.
https://doi.org/10.1109/TSTE.2023.3237922 - Navon, A., Belikov, J., Ofir, R., Parag, Y., Orda, A., Levron, Y. Death spiral of the legacy grid : a game-theoretic approach for studying grid defection // iScience (2023) vol. 26, 4, art. 106415, 17 p. : ill.
https://doi.org/10.1016/j.isci.2023.106415