Control integrado en modo continuo y discontinuo de un convertidor interleaved DC-DC para sistemas de almacenamiento de energía híbridos
Nowadays the energy storage technologies and its limitations are one of the main challenges for electric vehicles (EV) massification. Considering the slow development in this field, hybrid solutions (HESS), combining two or more storage mediums based on different operating principles, have been prop...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Chile |
| OAI Identifier: | oai:repositorio.anid.cl:10533/249793 |
| Acceso en línea: | https://hdl.handle.net/10533/249793 |
| Access Level: | acceso abierto |
| Palabra clave: | Ingeniería y Tecnología Ingeniería Eléctrica, Ingeniería Electrónica, Informática Ingeniería Eléctrica y Electrónica |
| Sumario: | Nowadays the energy storage technologies and its limitations are one of the main challenges for electric vehicles (EV) massification. Considering the slow development in this field, hybrid solutions (HESS), combining two or more storage mediums based on different operating principles, have been proposed. A typical configuration consists of the combination of a battery bank for driving range, and a supercapacitor bank for the mitigation of load impacts, extending the life of the former. Interleaved DC-DC converters provide high current capacity and low ripple, being an attractive solution for connecting the supercapacitor bank to the DC bus. However, the dynamical model of the converter varies with respect to the conduction mode, which in combination with the parasitic effects of its inductors, increases the control scheme complexity. This generally results in the oversizing of these magnetic components, increasing the weight and volume of the converter. In this work, converters based on inductors with concentrated airgap, in which inductance and resistance are constant; and the ones based on powdered metal, in which the inductance is variable, are studied. Regarding the nature of the studied inductor, and through a period by period analysis, the current of the converter is modeled as a nonlinear time-varying state system. The supercapacitor and battery voltage dynamics are neglected, being time-varying parameters. By means of an internal control of the maximum current, and an external transformation between the stationary average and maximum currents, the proposed control scheme is obtained. Additionally, an algorithm for parameter estimation is proposed. The simulation results verify both control schemes for constant parameters, and variable inductance. In the case of the estimation algorithm, the results for variable inductance are unsatisfactory, due to the deviations between local estimates. Finally, the proposed model for soft saturation and the control scheme are experimentally verified. To increase the performance obtained, it is proposed to include an integral action in the maximum current controller, experimentally reducing the average current error. |
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