Design and Realization of Ultra Gain Boost Seven Level Inverter for Solar PV System

A new triple gain boost seven-level inverter is proposed for solar photo voltaic (PV) system suitable for standalone and grid-connected operations. The system is developed with a boost cascaded two-stage configuration. The principal stage comprises of a high gain DC–DC converter to boost and normalise the input DC voltage with a single switch high gain converter (SSHGC), and the subsequent stage comprises of new multilevel inverter (MLI) topology with triple voltage gain to produce seven level AC. Proposed SSHGC is suitable for a wide conversion range. The switched capacitor techniques were employed to gain the voltage in MLI. The maximum voltage gain of the DC–DC converter is twelve and the voltage gain of the MLI is three, the resultant voltage DC–DC–AC is achieved up to 36. Modified Perturb and Observe (P&O) based maximum power point tracking (MPPT) algorithm is applied in SSHGC to achieve maximum power utilisation in PV module and sinusoidal pulse width modulation (SPWM) is realistic in MLI control. A prototype model of 200 Watts is developed to analyze the proposed system. The overall converter system efficiency reaches up to 92% with a total harmonics distortion (THD) of 0.18%.