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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.

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This paper presents an implementation of a three phase Voltage Source Converter (VSC) as shunt active power filter for harmonic reduction under nonlinear loads. Traditionally, the Synchronous Condenser, Thyristor Controlled Reactor (TCR) and Thyristor Switched Capacitor (TSC) are implemented for harmonic reduction under nonlinear loads. The passive filters are required to achieve the desired harmonic reduction in traditional methods. The addition of filters suffers from the resonance. The proposed methodology avoids the requirement of additional filters to achieve the better total harmonic reduction for various types of loads. Sinusoidal Pulse Width Modulation (SPWM) is used to control Voltage Source Converter. The results are compared with traditional methods. The proposed work is validated through simulation results.