Design and Implementation of a Dual DC Source-based Quasi-Switched Boost Inverter for Renewable Energy Applications

Abstract

ABSTRACT Recently, single-stage boost inverter topologies like Z-Source Inverter (ZSI), Switched Boost Inverter (SBI) and quasi-Switched Boost Inverter (qSBI) are gaining more attention in Renewable Energy Source (RES) applications. This paper proposes a dual dc source-based qSBI (DqSBI) topology which can be used as a micro-inverter for integrating various RES like solar photovoltaic, fuel cell etc. This study explains the principle of operation, design and steady-state analysis of the DqSBI topology. It also presents a performance comparison with conventional dc-dc boosted inverter and SBI topologies. The proposed inverter topology can achieve high voltage gain with low voltage stress across the switch, capacitor and diode. By using shoot through duty ratio, this topology provides a 110 V (rms) ac from a 324 V dc link voltage. The dc link voltage is obtained from a dc source of 36 V. The THD in the output voltage is 4.13%. Due to the reduced THD, the filter size and cost of the entire system are reduced. A 200-W laboratory prototype is developed to verify the theoretical concepts with an output voltage of 110 V (rms)/50 Hz. The Simple Boost Control (SBC) modulation strategy is used to generate shoot through and non-shoot through pulses. The modulation control algorithm is implemented using Spartan −3E Field Programmable Gate Array (FPGA) processor.