This paper presents a detailed derivation of the small-signal model and components design considerations for the quasi-Y-source inverter. The design methodology is based on the converter steady-state operation, considering the impedance network inductor and capacitor voltage and charge balances, respectively. Moreover, the additional design criteria for component selection, considering control constraints and performance compromise, are given by parametric variation analysis based on converter dynamic response. The small-signal model and transfer functions are obtained using a state-space averaged model, including converter non-ideal characteristics given by equivalent-series resistances (ESR), which makes possible the proposition of different control strategies, using both single or multi-loop schemes. To demonstrate the usefulness of the proposed small-signal model, a DSP-based single-loop type-II PI control strategy is used in which the peak DC-link voltage is indirectly controlled through the measurement of the impedance network capacitor voltage. The controller and converter performances are verified with simulation and experimental results and successfully confirm the validity of the proposed dynamic model. Finally, the obtained results are validated with a built small-scale three-phase/three-wire inverter prototype.
ResumoEste artigo traz um projeto completo de um No-Break de 3kVA de saída, para aplicações residenciais, sendo uma importante contribuição para o meio acadêmico e comercial. Permite ainda a utilização de painéis solares, podendo tornar a carga em questão menos dependente da rede elétrica, além da utilização da energia limpa. Para tanto foi implementado um protótipo em campo, com banco de baterias de 150V, utilizando como controle geral um Digital Signal Controller (DSC) da família DSP56F800E da Freescale
AbstractThis paper presents a complete design of a UPS 3kVA for residential applications and it is an important contribution to the academic and commercial environment. It also allows the use of solar panels, can make the load in question less dependent on the grid, and the use of clean energy. To this end we implemented a prototype in the field with battery bank of 150V, using as general control a digital signal controller (DSC) family of DSP56F800E Freescale TM .
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