Title: A novel adaptive control approach for three-phase improved power quality converter under distorted and unbalanced AC mains
Authors: Deepak Sharma; Abdul Hamid Bhat; Aijaz Ahmad; Nitin Langer
Addresses: Electrical Engineering Department, National Institute of Technology Srinagar, Kashmir, India ' Electrical Engineering Department, National Institute of Technology Srinagar, Kashmir, India ' Electrical Engineering Department, National Institute of Technology Srinagar, Kashmir, India ' Electrical Engineering Department, Model Institute of Engineering and Technology, Jammu, India
Abstract: In this paper, a novel simplified control technique is proposed to control three-phase improved power quality converter for disturbed AC mains. The proposed technique is based on retransformation of Clarke transformation. The trajectory of reference vector is very important for SVM technique to obtain exact switching times. Due to disturbed supply in a three-phase system, the trajectory of reference vector gets affected which results in low input power factor, high input current THD and high ripple factor of the DC output voltage in power converters. In the proposed technique, PI operation is implemented for the retransformation of Clarke transformation. The modified Clarke transformation generates a required shape of the trajectory of reference vector so that the system performs satisfactorily even under disturbed AC mains. Moreover, the proposed scheme has the advantage of fast response and is simple enough to be implemented in a single-chip microcontroller. The simulation results are presented to demonstrate the effectiveness of the new proposed control technique.
Keywords: improved power quality converters; IPQC; multilevel converters; harmonics compensation; unbalanced AC mains; space vector PWM; pulse width modulation; SVPWM; adaptive control; Clarke transformation; switching times; simulation; THD; total harmonic distortion; ripple factor; power converters; single-chip microcontrollers.
International Journal of Industrial Electronics and Drives, 2016 Vol.3 No.2, pp.55 - 66
Received: 07 Jul 2016
Accepted: 17 Jul 2016
Published online: 12 Jan 2017 *