Recital analysis of multilevel cascade H-bridge based active power filter under load variation

This paper investigates a 13-level cascaded H-bridge (CHB) converter for shunt active power filter (SAPF) application to minimize the total harmonic distortion (THD) of source current under load variation. The converter configuration comprises of six H-Bridge cells per leg. Carrier-based phase disposition PWM is used as a modulation strategy to control the switches of 13-level CHB topology. An instantaneous real and reactive power technique based harmonic current extraction method is implemented to extract the reference currents. The proportional-integral controller is implemented to control the DC voltage of the SAPF. The proposed 13-level CHB SAPF performance is compared with two-level voltage source SAPF, three-level CHB SAPF, five-level CHB SAPF and nine-level CHB SAPF. The proposed work is implemented using Matlab/Simulink. The comparative performance analysis of THD, harmonics, active power, reactive power and power factor are presented.