Transformer less, lower THD and highly efficient inverter system

Total Harmonic Distortion (THD) of a voltage or current signal causes power system losses, apparatus overheating and increases the power bills. This paper proposes the design and implementation of a transformer less single-phase inverter system that produces an output voltage of desired magnitude and frequency at a very lower THD. In ‘general inverter system’, a lower DC voltage is inverted into lower AC voltage which is further boost up to distribution level through a step up transformer. This system contains higher THD. But, the ‘proposed inverter system’ efficiently converts a 12V DC into 220V AC at a lower THD. By analysis on a real system, both topologies are simulated. Here PSIM simulation software is used. From the comparison of the simulation output, lower THD is demonstrated for ‘proposed inverter system’ than ‘general inverter system’.