Comparative study interleaved inverter with boost stage and active decoupling circuit

Abstract

Google little box challenge competition attracted high interest to problem of size and cost reducing of the converter as a part of photovoltaic power supply system. One of the ways is find a proper topology of the inverter. Selected for analyze solution is interleaved inverter. The assumption is made that the energy in passive component is in proportion through the inductor current. The reducing of the energy in passive component is expected for the selected solution. Selected schema consists of three main functional blocks. The first one is parallel boost converter with interleaving of switch control signal. The second part is an active decoupling circuit. Its main role is reducing of power pulsation on input of the inverter. And the third part is single phase interleaved inverter with output LCL filter. For estimation of energy reducing conventional solution also was considered. As conventional solution boost full bridge inverter with active decoupling circuit was selected. It consists of the same functional parts without interleaving switch control signals. The main goal of this paper was the definition and presentation the efficiency of boost interleaved inverter with active decoupling circuit in field of size and value optimization for inductors. Two models are made for simulation of both schemas. As simulation environment PSCAD version 4.5 is used. Both schemas have the same parameters: input voltage 150 V, output power 1 kW, switching frequency 50 kHz.

Данна стаття представляє результати порівняння моделей інвентора з фазовим перекриттям сигналів керування, перетворювачем, що підвищує та ланцюжком розв'язки активної потужності з мостовим інвентором з перетворювачем, що підвищує. Порівняння наведено для відносних величин енергій в пасивних компонентах. Ця система розрахована на вихідну потужність 1 кВт та широкий діапазон вхідної напруги. Наведено результати розрахунку компонентів та результати моделювання.