Abstract
Standalone power systems are the key to electrify remote areas where extending the grid connectivity is not economically/logistically feasible. Solar PV systems with battery backup is the most common and suitable energy source for standalone systems. This paper presents a novel multi-port converter (MPC) for PV battery systems powering standalone loads. The proposed converter is a reduced stage power converter based on current fed dual active bridge converter topology controlled by dual PWM plus Phase Shift Control. CF-DAB provides features like galvanic isolation, zero voltage switching and a high voltage ratio without sacrificing efficiency. The proposed converter performs dual functions of MPP of the solar panel, and regulates the load voltage while using reduced number of power conversion stages. This is made possible by sharing of components between the various stages that includes MPPT, voltage boosting and DC/AC conversion stage. The paper presents a small signal model of CF-DAB converter which is required for the close loop control of the proposed MPC. The MPC is simulated in PLECS simulation platform under various steady state and dynamic conditions and the simulation waveforms are presented. Experimental validation has been done and those results are also presented.
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