Experimental Investigations on Single-Phase Shunt APF to Mitigate Current Harmonics and Switching Frequency Problems Under Distorted Supply Voltage

ABSTRACT

This paper presents an experimental validation of, phase-lock loop less modified control strategy for single-phase shunt active power filter (APF) to compensate current harmonics and reactive power in single-phase distribution system under distorted supply voltage. The control technique is divided into two parts: first associated with selected frequency signal extraction by using Hilbert transform-based adaptive tuned filter from distorted supply voltage followed by reference current signal generation using DC-link energy balance method. Second deals with an improved pulse width modulation technique which reduces switching ripple and switching frequency for voltage source inverter used as a shunt APF. The overall control scheme is simulated using MATLAB/Simulink environment in the steady state and transient condition of the load. A detailed hardware design and other parameters of proposed system have been presented. A laboratory prototype has been developed using dSPACE DS1104 controller card having TMS320F240 as a slave DSP to verify the simulation results. Simulated and experimental results show that the proposed control technique gives a flexible and fast dynamic response in single-phase distribution system. The harmonic spectral performance of the proposed technique is as per the recommendation of IEEE-519 standards.

KEYWORDS:

• Adaptive tuned filter
• Power quality
• Single-phase shunt APF
• Unipolar switching scheme
• Hilbert transform

ORCID

Vijayakumar Gali http://orcid.org/0000-0001-7935-6189

Additional information

Notes on contributors

Vijayakumar Gali

Vijayakumar Gali did his B.Tech (EEE) from KITS Warangal in 2009. He completed his master’s degree from GCE Kannur, in 2013. Currently, he is doing his research work as MHRD scholar in the area of active filters in Electrical Engineering Department at MNIT Jaipur.

Nitin Gupta

Nitin Gupta did his graduation and post-graduation in 2000 and 2008, respectively. He finished his research work in the area of Power Quality from IITR, Uttarakhand. Presently, he is Asst. Prof. in Elect. Engg. Dept., MNIT Japiur. Email: [email protected]

R. A. Gupta

R. A. Gupta did his graduation and masters from University of Jodhpur in Electrical Engineering 1980 and 1984. He completed his research work from Indian Institute of Technology Roorkee in 1996 in the area of Cyclo-converters. Presently, he is associated as Prof. with Elect. Dept., MNIT Jaipur. He guided many Ph.D students and completed several projects. Email: [email protected]