Digital Non-linear Controller-based Active Power Filter for Harmonic Compensation

Abstract

This paper presents a design and implementation of digital non-linear controller-based, three-phase shunt-active filter for power line conditioner system. The active power filter is implemented with PWM-Voltage Source Inverter and its switching pulses are generated from Space Vector Modulation techniques. The active filter is applied for power quality improvements by compensating harmonics in the distribution network due to non-linear loads. The harmonic components are extracted from the sensed load currents from proposed non-linear control strategy. A simple and efficient Phase Locked Loop is used to synchronize the angle of vector orientation, which cancels the effect of harmonics and notches in the distribution network. An inner and outer loop Pl-control is incorporated with non-linear method for harmonic current control and dc-bus voltage regulator. Additionally, pre-filter is inserted at the input of each current loop in order to compensate for the effect of the left hand zero in the closed loop transfer functions. The entire control method is validated through MATLAB and also coded in assembly language for digital hardware implementation. The digital control algorithm is evaluated through TMS320F240 Digital Signal Processor for 10 kVAR active filter system.

Keywords:

• Active power filter system
• Digital signal processor controller
• Harmonic currents
• Non-linear controller
• Power quality

Additional information

Notes on contributors

P. Karuppanan

P. Karuppanan obtained B.E Degree in Electronics and Communication Engineering from Madurai Kamaraj University in 2004. He creditably completed his M.E Degree in VLSI Design from Anna University in 2007. He awarded Ph.D from National Institute of Technology-Rourkela in the Department of Electronics and Communication Engineering in 2013. Currently, he is Kamala Kanta Mahapatra received B.Tech degree with Honours in 1985 from University of Calicut, Master’s in 1989 from Sambalpur University and Ph.D from Indian Institute of Technology, Kanpur in the year 2000 in Electrical Engineering .Currently, he is a Professor in the Electronics and Communication Engineering Department of National Institute of Technology an Assistant Professor in the Electronics and Communication Engineering Department of Motilal Nehru National Institute of Technology Allahabad; he assumed this position since October 2012. His specialization is focused on Renewable energy system, Power quality, and Analog as well as Digital VLSI design. E-mail: [email protected]

Kamala Kanta Mahapatra

Kamala Kanta Mahapatra received B.Tech degree with Honours in 1985 from University of Calicut, Master’s in 1989 from Sambalpur University and Ph.D from Indian Institute of Technology, Kanpur in the year 2000 in Electrical Engineering .Currently, he is a Professor in the Electronics and Communication Engineering Department of National Institute of Technology Rourkela; he assumed this position since February 2004. He is a Fellow of the Institution of Engineers (India), His research interest includes Power Electronics, Embedded Systems, Electronic Circuits, FPGA based System design and VLSI Design. E-mail: [email protected]