Realization of cascaded H-bridge 5-level multilevel inverter as Series Active Filter

Nowadays, modern industrial devices are mostly based on electronic devices such as programmable logic controllers and electronic drives. The electronic devices are very sensitive to Disturbances and become less tolerant to power quality problems such as voltage sags, swells and harmonics. Among all the power quality issues voltage sag and voltage swell occupies a major role. To solve this problem, custom power devices are used. One of those devices is the Series Active Filter (SAF) which is the most efficient and effective modern custom power device used in power distribution networks. To achieve the better performance of the power system, closed loop system is designed. In closed loop control of SAF, Synchronous Reference Theory (SRF) is used for reference signal generation. Series Active Filters (SAF) is designed for load voltage regulation of single-phase as well as three-phase voltage harmonic source type nonlinear loads. MATLAB simulations have been carried out for both open loop and closed loop for voltage sag, swell and flickering.