Optimized Passive Filter Design Using Modified Particle Swarm Optimization Algorithm for a 12-Pulse Converter-Fed LCI–Synchronous Motor Drive

The load-commutated inverter (LCI)-based synchronous motor (SM) drive that is fed by a 12-pulse ac-dc converter results in harmonics mitigation. These drives have a further improved power quality at the ac mains if an appropriate passive filter is used at the ac mains for power factor (PF) correction and harmonics reduction. This paper deals with a simplified optimization algorithm based on a particle swarm optimization method for the selection of passive filter components. This algorithm is used to design passive filters for three types of loads on an LCI-SM drive, i.e., constant-torque-variable-speed loads, constant-speed-variable-torque loads, and variable-speed-variable-torque loads, to meet the requirements of a wide range of applications. The obtained results show reduction in the total harmonic distortion in the current and voltage at ac mains, reduced supply current, and improved PF.