The widespread adoption of photovoltaic (PV) and electric vehicle (EV) technologies is crucial for mitigating greenhouse gas emissions. A Multi-Port Converter (MPC) connects multiple PV panels, improving efficiency and reducing costs. In EVs, MPCs extend battery lifespan by adding energy sources, enhancing system quality beyond reliance on Li-ion batteries. This dissertation proposes a Quad-input LLC topology for PV microinverters. It utilizes a single LLC resonant tank and two Y switches configurations. An MPPT control strategy based on Perturb and Observe (P&O) method ensures independent MPPT for each panel. The zero-voltage switching (ZVS) is achieved across all switches for wide input range and load variations. A 500W prototype validates the operation, achieving peak efficiency of 94.3% with individual MPP tracking. Also, a high gain DC-DC converter for hybrid inverter is proposed. The proposed converter can be used in the PV panel level for hybrid inverter where the low voltage of PV must be increased to DC-link voltage. The proposed converter uses two inductors connected either in series or parallel during discharge or charge mode. The designed hybrid system based on this high gain converter has three ports that can be connected to PV, battery, and grid/ac load. In addition, a bidirectional hybrid DC-DC converter (BHDC) is proposed for hybrid energy storage systems in electric vehicles. The converter can connect both batteries and supercapacitors to the DC-link. With a wide voltage-gain range, low voltage stress on power switches, and common ground between low and high voltage ports, the converter achieves zero-voltage switching (ZVS) via synchronous rectification, improving efficiency. A 300W prototype with a 94.8% maximum efficiency in step-up mode and 94.2% in step-down mode was built to validate the wide voltage gain range and voltage control scheme.

Made available in DSpace on 2016-12-12T20:27:38Z (GMT). No. of bitstreams: 1 Marcos Vinicius Bressan.pdf: 3794882 bytes, checksum: c55b9af15d7d913dc3d962a990a792c4 (MD5) Previous issue date: 2014-02-18 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This work present a new three-phase hybrid multilevel inverter, that is composed of two topologies in cascaded association. The three-phase NPC and the half-bridge modules are connected in series. This con¬nection increases the number of the output voltage levels, improves the output voltage quality and rises the power process by inverter. The theoretical analysis is presented, the switching states are investigated and the average and the RMS currents values in the semiconductors are verified. Based on the current values are projected the dc capacitors, and analyzed the semicondutors loss energy and the input currents of the inverter. Two modulation scheme are presented at proposed inver¬ter, the hybrid PWM and SVM modulation scheme. The first part of the experimental results are verified behavior of the multilevel power structure developed in laboratory. The second part of the experimen¬tal results evaluates quality of output voltage with different modulation scheme using of the mathematical tools THD and WTHD. / Este trabalho apresenta um novo inversor multinível híbrido trifásico, que é formado pela associação em cascata de duas topologias. No caso, um conversor NPC trifásico conectado em série a módulos de converso¬res meia ponte. A ligação em série desses conversores permite ampliar o número de níveis de tensão sintetizados pelo inversor, melhorar a qualidade da forma de onda da tensão de saída e o aumento da energia processada pelo inversor. Uma análise teórica do inversor é apresen¬tada, averiguando as etapas de operação e determinando os valores médio e eficaz da corrente nos semicondutores de potência. Com base nas análises dos valores médio e eficaz da corrente nos semicondutores dimensiona-se os capacitores de barramento, assim com a energia dissi¬pada pelos semicondutores e a análise teórica das correntes de entradas do inversor empregando de retificadores multipulsos. Também são apre¬sentadas duas técnicas de modulação ao inversor proposto: a técnica de modulação PWM híbrida e a SVM. Os resultados experimentais, em sua primeira parte, avaliam o comportamento da estrutura multinível desenvolvida em laboratório. Na segunda parte dos resultados experi¬mentais, avalia-se qualidade da forma de onda de tensão com diferentes técnicas de modulação utilizando das ferramentas matemáticas THD e WTHD.