Design and Analysis of a Boost Type Nine-Level Inverter with Reduced Switch and Capacitor Voltage Stress

This article proposes a boost type (BT) nine-level (9L) switched capacitor (SC) based transformerless inverter topology fo grid connected solar photovoltaic systems. It uses a single source, 10 switches, 2 diodes and 3 SCs. The voltage across the Sc is even which is only half of the output voltage v<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</inf>/2 and does not employ any complex algorithms for their voltage balancing. Power switches voltage stress is significantly low for the proposed topology and hence low total standing voltage per unit (TSV<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p.u.</inf>). The different modes of operation and design of SC are presented. The simulation verification and prototype results are presented to confirm the operability of the proposed topology. Further, a detailed comparison of same art of topologies has been presented to highlight the features of the proposed topology.