A Novel Concept of Simultaneous Voltage Sag/Swell and Load Reactive Power Compensations Utilizing Series Inverter of UPQC
Kavitha.M1, S.Radha Krishna Reddy2, S. Md3. Mazhar-Ul-Haq4, JBV Subrahmanyam5, R.V Amarnath6

1M. Kavitha, B.Tech, ADAMS COLLEGE OF ENGG , Palvancha Khammam Dist, Andhra Pradesh, India.
2S. Radha Krishna Reddy, Associate Professor, Holy Mary Institute of Technology & Science ,Bogaram, R.R. Dist, Hyderabad, Andhra Pradesh, India.
3S.md.mazhar-ul-haq, Assistant Professor At Brindavan Institute Of Technology & Science, kurnool
4Dr.JBV Subrahmanyam, Doctorate in Electrical Engineering from JNTU-Hyderabad, India,
5Prof.R.V.Amarnath, Professor & HOD of EEE Department, HITS College of Engineering, Bogaram, R.R Dist., A.P., India.

Manuscript received on July 01, 2012. | Revised Manuscript received on July 05, 2012. | Manuscript published on July 10, 2012. | PP: 130-138 | Volume-1, Issue-2, July 2012. | Retrieval Number: B0156061212/2012©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: —This paper introduces a new concept of optimal utilization of a unified power quality conditioner (UPQC). The series inverter of UPQC is controlled to perform simultaneous 1) voltage sag/swell compensation and 2) load reactive power sharing with the shunt inverter. The active power control approach is used to compensate voltage sag/swell and is integrated with theory of power angle control (PAC) of UPQC to coordinate the load reactive power between the two inverters. Since the series inverter simultaneously delivers active and reactive powers, this concept is named as UPQC-S (S for complex power). A detailed mathematical analysis, to extend the PAC approach for UPQC-S, is presented in this paper. MATLAB/SIMULINK-based simulation results are discussed to support the developed concept. Finally, the proposed concept is validated with a digital signal processor-based experimental study. 
Keywords: Active power filter (APF), power angle control (PAC), power quality, reactive power compensation, unified power quality conditioner (UPQC), voltage sag and swell compensation.