Comparison of quadratic boost topologies operating under sliding-mode control
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The recent development of dual-stage photovoltaic micro-inverters motivates the study of DC-DC converter topologies with high-gain capabilities. Following this idea, a comparison of both static and dynamic performances of the known quadratic boost converter topologies is tackled in this paper. To achieve an accurate comparison, we use the same electronic components and the same control scheme. Considering its advantages, a sliding-mode control law has been proposed to reach a stable equilibrium point in the switching converters. The sliding surface uses only the input current following a constant reference. This current reference is adjusted to obtain an output voltage of 400 V for an input voltage between 15 and 25 V and an output power between 20 and 120 W. The local stability of the proposed control law is tested by using the Routh-Hurwitz criteria. The comparison is accomplished using simulation results to disclose the best configuration in terms of efficiency, dynamic response and applicability in photovoltaic generation.