Power quality enhancement using cascaded multilevel inverter based shunt hybrid active power filter

Abstract

This paper investigates mitigation of current harmonics using different configuration of cascaded multilevel inverter based shunt hybrid active power filter (SHAPF) and to improve power quality of the system. The main objective of this paper is to develop and analyze the compensation characteristics of cascaded multilevel inverter based shunt hybrid active power filter by employing indirect current control algorithm. The indirect current control algorithm is employed to generate reference current and phase disposition pulse width modulation technique is incorporated to generate gating signal for shunt hybrid active power filter strategy. The nonlinear loads are connected to distort the source current to 21% of harmonics distortion, as per IEEE 519 allowable current harmonic distortion is 5%. To mitigate harmonic distortion, cascaded multilevel inverter based shunt hybrid active power filter is proposed and after compensation the source current harmonic distortion is reduced to 2.93%. The simulation analysis is carried out using SIMPOWERSYSTEMS block set of MATLAB/SIMULINK to determine which of the inverter topology based shunt hybrid active power filter strategy perform better on compensating source current harmonic distortion.

A New Structure of the Nine Level Inverter Used as Active Power Filter with a Reduced Number of Swiches

“…The comparison shows that a nine level inverter can be realized with ten IGBT transistors for each phase. Unlike conventional systems such as NPC and cascade type inverters [29] [30] which require sixteen IGBT transistors, the proposed nine-level topology having less crowded and less expensive structure while maintaining the system performances.…”

Indirect Effective Controlled Split Source Inverter-Based Parallel Active Power Filter for Enhancing Power Quality

“…A five-level cascaded H-bridge (CHB) was implemented using a space vector pulse width modulation technique [17], which was a complex scheme of producing PWM signals. In active power filters, instead of the conventional inverters, MLIs can be used but the PWM generation with greater driver units makes the compensation scheme very complex [18].…”