The growth of Power Electronic industry is focused towards the development of new power devices, higher rated switches and reduced blocking voltages for the desired operations to cater the needs of domestic and other industrial sectors especially in the field of variable frequency and variable voltage applications. The appropriate choice is the power modulators and emphasises to continue exploring alternatives The Phase Disposition Pulse Width Modulation strategy is utilized to generate control input of the switches and ensure the desired operation of the power modules. It follows to bring in modified topology based on twin source cells to extract a variable amplitude output voltage with the theory of fundamental switching using optimal switching angle control. The optimised angles are derived using Galactic Swarm Optimisation (GSO) technique. The effort is further carried to derive the optimal structures of the proposed topology based on different optimisation parameters like maximisation of levels and minimisation of switches. The study propels with MATLAB based simulation and experimental results obtained using dSPACE controller DS1104 / Cyclone IV E FPGA for the appropriate prototypes to illustrate the viability of the proposed concepts. The promising nature of the presentation, expands the insight of utilizing the MLIs for sustainable power source related applications.