A Bat Source String Succored Serrated H-Bridge Symmetrical MLI for Solar PV - Grid Integration

A Bat Source String Succored Serrated H-Bridge Symmetrical MLI for Solar PV - Grid Integration Abstract: Multilevel inverters (MLIs) are triumphal in synthesizing a nearly sinusoidal AC voltage from multiple separated dc sources (SDCs) in the pattern of steps resembling a typical staircase and succors in achieving a subtle harmonic distortion. In addition, the MLI offers control degree of freedoms (CDOFs) in the circuit structure for an 'm' level output, in the participating devices for a specific mode of working, and also in the modulation strategy as opposed to the conventional three-level voltage source inverter (VSI). The pristine MLI topologies, the cascaded H-bridge MLI, the flying capacitor MLI and diode clamped MLI, suffer with the demerits such as more number of components and also higher voltage stresses on the individual switches. In this innovation, a component count waned bat source string succoured serrated H bridge MLI (BS 4HBMLI) is proposed using bat source strings, a modified H-bridge and complementary dc links. The bat source string is a module, which involves two SDCs and two switches (one is source inclusion switch and the other is source bypassing switch). As this string module is connected in the MLI structure in the reverse hanging fashion like the bat species hang upside down, this module is named as bat source string. An inventive modification in the H-bridge serrates the H-bridge, wherein the left side arm includes additional switches, the right side arm is unchanged, and both arms are linked by rung switches (instead direct connections). The developed topology synthesizes a thirteen level output in the symmetrical mode of operation, and to tackle the asymmetrical mode of operation, it requires a suitable addition in the structure and offers a ninteen level output. Apart from the dual mode (symmetrical and asymmetrical) capability and reduced number of components, the proposed BS 4HBMLI involves lesser number of devices in the current conduction path, which is a peculiar and rare characteristics. At the seventeen level output, the suggested BS 4HBMLI requires 14 switches while the pristine and the nearest competing structure demand 32 and 20 switches, respectively. The mathematical investigation results relations for different components' (switches, SDCs, etc.) counts in terms of the output level 'm'. The comprehensive simulation study in MATLAB environment reveals the total harmonic distortion (THD) and other harmonic profile fo