Abstract
This paper presents a boost DC-DC converter topology with non - isolated high gain and output midpoint, to boost the voltage obtained from solar photovoltaic panels. The three-level boost converter is coupled to the output port of the single-switch quadratic boost converter to derive the proposed converter topology. The voltage gain of the proposed converter is greater than that of the classical boost converter. The voltage stress on the switches of the proposed converter is equal to half of the converter output voltage. Static analysis, operating modes, experimental waveforms in continuous current conduction and discontinuous current conduction modes are shown. A 520 W prototype converter was implemented in the laboratory and its results are presented.
Highlights
In photovoltaic systems with multiple modules connected in series, partial shadowing can lead to a reduction of voltage and power available from the panels together
The power of a photovoltaic panel is between 100 W and 350 W, and the voltage at maximum power point is 12 V to 42 V
With high voltage gain and low input current ripple, a converter topology based on interleaving technique was proposed in [23]
Summary
In photovoltaic systems with multiple modules connected in series, partial shadowing can lead to a reduction of voltage and power available from the panels together. The voltage gain can be increased by using magnetic coupling, coupled inductors based high gain converters are introduced in [11, 12] With this technique, the ripples in the inductor current and the reverse recovery problems in the diodes are reduced. A converter topology utilizing three-state cell and voltage multiplier cell was proposed in [17] This solution may be limited to high power applications as a function of the current flowing through the capacitors. With high voltage gain and low input current ripple, a converter topology based on interleaving technique was proposed in [23]. This article proposes a new topology for high gain DC-DC converter based on quadratic feature, which use low voltage switch and access to the midpoint of the output voltage.
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