Browsing by Author "Zapata Amores, Jaime Wladimir"
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Thesis PARTIAL POWER DC-DC CONVERTERS FOR TWO STAGE PHOTOVOLTAIC ENERGY CONVERSION SYSTEMS(2018) Zapata Amores, Jaime Wladimir; Departamento de Electrónica; Kouro Renaer, Samir FelipeTwo-stage photovoltaic (PV) con gurations (for microinverters, string or multistringinverters) have become increasingly popular due to the decoupling betweenthe inverter dc-link voltage and the PV voltage, adding exibility toextend the MPPT range. However, the additional dc-dc converter increases thecomponent count, reduces the volume and power converter losses. The conceptof partial power converters (PPC), which reduces the amount of power handledby the dc-stage can mitigate this eect. However, the type of topology, itspower and voltage rating, eciency, and operating range can vary signi cantlydepending on the type of PV application and scale. Furthermore, the type offunction of the dc-dc stage will also dier depending on the PV application.From boosting with a high step-up ratio for one module in a microinverter, to abuck mode for larger PV strings when using modern 1500V isolation modules.This thesis provides an analysis of the possible combinations of connectionsand corresponding applications based on the scale of the PV system. The threemost suitable solutions for practical PV systems are further elaborated, includingsimulations and experimental validation. Experimental results show thatthe PPC greatly improves the overall PV system eciency, even when the ef- ciency of the isolated dc-dc converter is low. An added bene t is that thedc-dc stage power rating achieved are only a fraction of the PV system, reducingsize and increasing power density of the power converter without aectingsystem performance.
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