Abstract
This paper proposes a family of step-up three-level DC-DC converter topologies suitable for photovoltaic panel integration applications. The proposed family is suitable to convert the 10–30 V from photovoltaic panels to a 150 V direct current distribution bus. The proposed family enhances the three-level topology in terms of the voltage gain, power density, and filtering requirements at the input level. The filtration is reduced by interleaving. The three-level boost converter’s voltage gain is enhanced by utilizing several options such as switched capacitor cells, switched inductor cells, and flyback transformers or coupled inductors. The enhancement techniques are illustrated by providing the circuit diagram and a comparison of the voltage gain and the number of required components. An example converter of a hybrid three-level boost converter with a flyback transformer is presented to convert 20 V from a photovoltaic panel to a 400 V. The theory of operation and steady-state analysis are provided for the example converter operating in the continuous conduction mode. The converter is simulated to extract the power from three PVL-136 photovoltaic (PV) panels by applying a maximum power point tracking algorithm. The theory of operation and simulation are confirmed with an 80 W experimental prototype, which has an efficiency of around 95% at 40 W load power.
Highlights
Power electronics converters are essential devices in all electronic systems and become increasingly important in renewable energy power processing and integration into the electric grid
Utilizing the flyback transformer with the traditional boost converter improves the voltage gain, as the turns ratio contributes to the output voltage [18]
This paper presents a family of high voltage gain three-level boost converters suitable for photovoltaic energy integration
Summary
Power electronics converters are essential devices in all electronic systems and become increasingly important in renewable energy power processing and integration into the electric grid. The parallel connection of solar modules increases the current, but the voltage is still as the one of a single panel, which necessitates a high voltage gain boost converter [9,10,11]. Using the traditional boost converter to operate in continuous conduction mode (CCM) at a high duty cycle requires a sizeable magnetic element and high voltage rating switching components [13,14,15]. Utilizing the flyback transformer with the traditional boost converter improves the voltage gain, as the turns ratio contributes to the output voltage [18]. The combination of switched-capacitor topologies with an interleaved boost converter increases the power density and achieves high voltage gain [27,28].
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