Non-Isolated SIDO DC-DC Converter With a High Controllability for PV Applications

This paper proposes a novel non-isolated single-input dual-output (SIDO) DC-DC converter with high controllability for application in on-grid photovoltaic (PV) systems. The proposed topology utilises a combination of a quadratic boost structure and voltage multiplier cells to improve the voltage gain of the converter. Also, it provides two output ports with different voltage levels, making the converter suitable for solar power plants, enabling simultaneous powering of internal loads and the grid-connected inverter through the same converter. Moreover, the proposed converter inherently distributes power asymmetrically between its output ports, prioritising the grid-connected load with a larger power share without needing an internal control loop. On the other hand, the controllability of this converter is significantly enhanced by employing the pole placement method. High voltage gain, soft switching of some switches and diodes, common ground, small ferrite cores, low-capacity capacitors, high efficiency, and high controllability are among the main merits of this topology. The operation of the proposed converter is discussed in detail and compared with other similar structures in the literature. Finally, a 200 W experimental prototype is used to validate the analysis results.