Abstract
A novel interleaved high step-up DC-DC converter based on voltage multiplier cell and voltage-stacking techniques is proposed for the power conversion in renewable energy power systems. The circuit configuration incorporates an input-parallel output-series boost converter with coupled inductors, clamp circuits and a voltage multiplier cell stacking on the output side to extend the voltage gain. The converter achieves high voltage conversion ratio without working at extreme large duty ratio. The voltage stresses on the power switches are significantly lower than the output voltage. As a result, the low-voltage-rated metal-oxide-semiconductor field-effect transistors (MOSFETs) can be employed to reduce the conduction losses and higher conversion efficiency can be expected. The interleaved operation reduces the input current ripple. The leakage inductances of the coupled inductors act on mitigating the diode reverse recovery problem. The operating principle, steady-state analysis and design guidelines of the proposed converter are presented in detail. Finally, a 1-kW prototype with 28-V input and 380-V output voltages was implemented and tested. The experimental results are presented to validate the performance of the proposed converter.
Highlights
Nowadays, demand for clean or renewable energy sources has dramatically increased with population growth and the depletion of fossil fuel
A new interleaved high step-up DC-DC converter based on voltage multiplier cell and voltage5
A new interleaved high step-up convertervoltage based on voltage multiplier cell and voltagestacking technique is proposed
Summary
Demand for clean or renewable energy sources has dramatically increased with population growth and the depletion of fossil fuel. Much effort has been made to explore renewable energy sources, such as photovoltaic (PV), fuel cell and wind energy systems [1,2,3]. If the energy needs to be converted to a single-phase 220 V ac voltage utility grid, a 380–400 V dc bus voltage is required for the inverter.
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