Original scientific paper
https://doi.org/10.7305/automatika.2015.07.750
A New Approach Based on Instantaneous Power Theory for Improving the Performance of UPQC Under Unbalanced and Distortional Load Conditions
Mahmoud Ebadian
; Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
Mohammad Talebi
; Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
Reza Ghanizadeh
; Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
Abstract
In order to deal with power quality problems under distortional and unbalanced load conditions, this paper presents a new control method for a four-wire three-phase unified power quality conditioner (UPQC) which is based on instantaneous power p-q theory. The proposed control approach is based on instantaneous power and is optimized by using a self-tuning filter (STF), without using any low-pass filters (LPFs) or phase locked loop (PLL), and without measuring load or filter currents. In this approach, the load and source voltages are used to generate the reference voltages of a series active power filter (APF) and source currents are used to generate the reference currents of a shunt APF. Therefore, the number of times that current is measured is reduced and system performance is improved. The performance of the proposed control approach is evaluated in terms of power factor correction, source neutral current mitigation, load balancing and mitigation of the current and voltage harmonics of distortional and unbalanced loads in a three-phase four-wire system. The results obtained by MATLAB/SIMULINK software show the effectiveness of the proposed control technique in comparison to the conventional p-q method.
Keywords
Current harmonic mitigation; power quality; source neutral current mitigation; unified power quality conditioner (UPQC); voltage harmonic mitigation
Hrčak ID:
152859
URI
Publication date:
20.10.2015.
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