Harmonics Reduction using 4-Leg Shunt Active Power Filters

International Journal of Electrical and Electronics Engineering
© 2016 by SSRG - IJEEE Journal
Volume 3 Issue 12
Year of Publication : 2016
Authors : K Srinivas
How to Cite?

K Srinivas, "Harmonics Reduction using 4-Leg Shunt Active Power Filters," SSRG International Journal of Electrical and Electronics Engineering, vol. 3,  no. 12, pp. 18-22, 2016. Crossref, https://doi.org/10.14445/23488379/IJEEE-V3I12P108


Harmonics in power system are caused by highly non-linear devices which degrade its performance. Controlling and reducing such harmonics have been a major concern of power engineers for many years. The line current harmonics cause increase in losses, instability, and also voltage distortion. With the proliferation of the power electronics converters and increased use of magnetic, power lines have become highly polluted. Both passive and active filters have been used near harmonic producing loads or at the point of common coupling to block current harmonics. The “Generalized Theory of the Instantaneous Reactive Power in Three-Phase Circuits", proposed by Akagi et al., and also known as the p-q theory, is an interesting tool to apply to the control of active power filters, or even to analyze three-phase power systems in order to detect problems related to harmonics, reactive power and unbalance. In this project, p–q theory based a new control algorithm is proposed for 3-phase 4-wire and 4-leg shunt active power filter (APF) to suppress harmonic currents, compensate reactive power and neutral line current and balance the load currents under unbalanced non-linear load and non-ideal mains voltage conditions. The APF is composed from 4-leg voltage source inverter (VSI) with a pair of DC-link capacitors and PWM current controller. All simulations are performed by using Matlab-Simulink Power System Block set. The performance of the 4-leg APF with the proposed control algorithm is found considerably effective and adequate to compensate harmonics, reactive power and neutral current and balance load currents under all non-ideal mains voltage scenarios. Simulation results obtained with MATLAB employing a three phase four wire shunt active filter test system.THD plots with and without APF is presented.


Harmonics, DSTATCOM.


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