Interline Hybrid Unified Power Quality Conditioner
This paper proposes a new interline hybrid unified power quality conditioner (IHUPQC) structure to improve the power quality of distribution feeders and to decrease the power ratings/voltages and switching losses of voltage source converters (VSCs). The IHUPQC consists of dynamic voltage restorer (DVR), an isolated dc-dc converter and a shunt hybrid active power filter (SHAPF) with a common dc bus. The inverse park phase locked loop (IP-PLL) technique is used to detect the distortions of signals in both feeders. Sinusoidal pulse width modulation (SPWM) based voltage control and current control are used for DVR and SHAPF respectively. The isolated dc-dc converter has PI controller based simple phase shift (SPS) technique. The performance of the proposed IHUPQC is evaluated through extensive simulations for mitigating voltage sag/swell and compensating current harmonics by using MATLAB/SIMULINK simulation tool.
 H. Mohamadi, Y. Varjani and H. Mokhtari, "Multiconverter Unified Power Quality Conditioning System: MC-UPQC, IEEE Transaction on Power Delivery, Vol. 24, NO. 3, pp. 1679-1686, March 2009.
 B. Han and G. Jang, “New Configuration of UPQC for Medium-voltage Application” IEEE Transaction on Power Delivery, Vol. 21, NO. 3, pp. 1438-1444, Feb 2008.
 S. Kavanki and K. Boddeti, "A Modified Three-Phase Four Wire UPQC Topology with Reduced DC-Link Voltage Rating," IEEE Transactions on Industrial Electronics, vol. 30, no. 1, pp. 1237-1253, Aug 2016.
 M. Brenna and E. Tironi “Improvement of Power Quality Using a Hybrid Interline UPQC, “ IEEE Transaction on Power Delivery, Vol. 24, NO. 3, pp. 2117-2126, May 2011.
 A. Take and M. Tumay, “Interline Unified Power Quality Conditioner” IET Generation, Transmisssion & Distribution, Vol. 11, No. 4, pp. 354-364, Jun 2012.
 G. S. Kumar, P. H. Vardhana, B. K. Kumar, and M. K. Mishra, “Minimization of VA loading of Hybrid unified power quality conditioner (HUPQC) in power system, “ IEEE Transaction on Power Delivery, Vol. 17, NO. 8, pp. 3132–3145 Mar 2012.
 T. Narongrit, K-L. Areerak and K-N. Areerak “The Comparison Study of Current Control Techniques for Active Power Filters” IEEE Transactions On Industry Applications Vol 12, No 34, July 2013.
 V. Khadkikar and A. Chandra, “A new control philosophy for a unified power quality conditioner (UPQC) to coordinate load-reactive power demand between shunt and series inverters, “IEEE Transaction on Power Delivery, Vol. 23, NO. 4, pp. 2522–2534, Oct 2011.