Browsing by Author "Kortabarria, Inigo"
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Item Design of a frequency adaptative control for a grid-connected single-phase voltage source inverter(2011) Kortabarria, Inigo; Andreu, Jon; De Alegría, Iñigo Martinez; Santamaría, Virginia; Robles, Eider; RENOVABLES OFFSHOREThis article focuses on the design of a control that resolves the traditional conflict between two of the most important properties of the single phase inverter connected to the network, i.e., current injection with low harmonic content and fast dynamics. To do this, the use of frequency selective solutions is proposed so that these only modify the response of the system for a limited range of frequencies. The solutions employed are, furthermore, frequency adaptive. In this way, the proposed control is completely resistant to variations in grid frequencies.Item FPGA based real time simulation of a Matrix Converter(2010) Ormaetxea, Enekoitz; Ibarra, Edorta; Andreu, Jon; Kortabarria, Inigo; Santosy, Maider; POWER SYSTEMSRecently, Matrix Converter (MC) has attracted the interest of the scientific community. Due to the complexity of its control, simulation of this converter is a time consuming task. In this work, an FPGA based MC model is presented, allowing the simulation of a detailed MC in real-time.Item PM-Assisted Synchronous Reluctance Machine Flux Weakening Control for EV and HEV Applications(2017-08-31) Trancho, Elena; Ibarra, Edorta; Arias, Antoni; Kortabarria, Inigo; Jurgens, Jonathan; Marengo, Luca; Fricasse, Antonio; Gragger, Johannes; POWERTRAINIn this manuscript, a novel robust torque control strategy for Permanent Magnet Assisted Synchronous Reluctance Machine drives applied to electric vehicles and hybrid electric vehicles is presented. Conventional control techniques can highly depend on machine electrical parameters, leading to poor regulation under electrical parameters deviations or, in more serious cases, instabilities. Additionally, machine control can be lost if field weakening is not properly controlled and, as a consequence, uncontrolled regeneration is produced. Thus, advanced control techniques are desirable to guarantee electric vehicle drive controllability in the whole speed/torque operation range and during the whole propulsion system lifetime. In order to achieve these goals, a combination of a robust second order current based Sliding Mode Control and a Look- up Table/Voltage Constraint Tracking based hybrid Field Weakening control is proposed, improving the overall control algorithm robustness under parameter deviations. The proposed strategy has been validated experimentally in a full scale automotive test bench (51 kW prototype) for being further implemented in real hybrid and electric vehicles.Item PWM algorithm with adaptive offset for three-level multi-phase Neutral-Point-Clamped Converters(2013) Lopez, Iraide; Ceballos, Salvador; Andreu, Jon; Kortabarria, Inigo; Pou, Josep; POWER ELECTRONICS AND SYSTEM EQUIPMENTThis paper proposes a PWM based modulation strategy particularly useful for three-level multi-phase Neutral-Point-Clamped Converters. It achieves similar results to those obtained with the space vector modulation but allowing a very fast and simple implementation in a digital controller. The proposed algorithm is able to maintain the neutral-point voltage under control by the addition of a zero-sequence voltage component to the modulation signals. A simple and efficient methodology to calculate the most appropriate zero-sequence component is described. In addition the modulation strategy is completely general, regardless the number of phases of the converter, and therefore it is easy extendible to n-phase converters.Item Stability analysis and design of droop control method in dq frame for connection in parallel of distributed energy resources(IEEE Computer Society, 2012) Planas, Estefania; Gil-De-Muro, Asier; Andreu, Jon; Kortabarria, Inigo; De Alegria, Inigo Martinez; POWER ELECTRONICS AND SYSTEM EQUIPMENTDroop control method is usually used when distributed energy sources are connected in parallel. The absence of communications between the distributed energy resources and its flexibility are some of its advantages. Moreover, a fictitious impedance can be added which improves the performance of the original technique. This fictitious impedance has to be properly designed in order to obtain a good stability and performance of the system. On the other hand, a restoration control that brings frequency and voltage amplitude of the microgrid to their nominal values is used in some cases. In this article, a linear model of a droop controlled microgrid with fictitious impedance and restoration control is implemented. Thanks to this linear model, an optimal fictitious impedance can be designed. Moreover, the influence of a proposed restoration control on the whole system can be studied. This way, the dynamic of the restoration control can be properly chosen. The stability as well as nominal values of frequency and voltage amplitude are guaranteed. Simulation results of the system confirm the validity of the proposed design.Item A Universal Formulation for Multilevel Selective-Harmonic-Eliminated PWM with Half-Wave Symmetry(2018-03-26) Pérez-Basante, Angel; Ceballos, Salvador; Konstantinou, Georgios; Pou, Josep; Kortabarria, Inigo; De Alegria, Inigo Martinez; POWER ELECTRONICS AND SYSTEM EQUIPMENTSelective-harmonic-eliminated pulsewidth modulation (SHE-PWM) can be utilized to improve the efficiency of multilevel voltage-source converters due to its ability to provide low switching frequency and tight control of low-order harmonics. In addition, SHE-PWM with half-wave (HW) symmetry provides a higher number of solutions than quarter-wave (QW) symmetry, and therefore, the waveform design can be improved. This work proposes a universal formulation, which can be utilized with HW symmetry, that provides a unique system of equations valid for any possible multilevel waveform. Thereby, without using predefined waveforms, this formulation provides the ability to search simultaneously both the firing angles and the switching patterns, simplifying significantly the search process and providing a high number of solutions. With the aim of selecting the optimum sets of firing angles, the solutions provided by HW and QW symmetries are compared, based on several metrics of harmonic performance, for particular test cases. Experimental results also validate the universal formulation with HW symmetry.