Performance analysis of unified power quality conditioner under different power quality issues using d-q based control

  • Sudheer Vinnakoti Jawaharlala Nehru Technological University
  • Venkata Reddy Kota Jawaharlal Nehru Technological University Kakinada
Keywords: , Power Quality (PQ), Unified Power Quality Conditioner (UPQC), Synchronous Reference Frame (SRF), Total Harmonic Distortion (THD)


Utility has to supply quality power to all consumers. Electrical equipment like compressors and pumps take heavy inrush of current during starting, causing voltage sag/swell. On the other hand, usage of Electric Drives and Switch Mode Power Supplies generate harmonics in the supply system. In this paper, Synchronous Reference Frame control applied to Unified Power Quality Conditioner is presented to regulate the load voltage and supply currents against supply voltage distortion, voltage sag/swell under non-linear and unbalanced loads. Using Matlab/Simulink, a three-phase four wire system under distorted voltage supply, voltage sag/swell and unbalanced non-linear load was developed. Active and reactive power flow analysis is also investigated in this study. Capacitor voltage balancing is maintained using PI controller. Simulation results prove that under unbalanced and nonlinear load conditions, UPQC effectively eliminates harmonics, compensates voltage problems like voltage sag/swell and improve power factor at supply.

Author Biographies

Sudheer Vinnakoti, Jawaharlala Nehru Technological University
Research Scholar,Department of Electrical Engineering.
Venkata Reddy Kota, Jawaharlal Nehru Technological University Kakinada
Asst.Professor,Department of Electrical Engineering


D. Daniel Sabin and Ashok Sundaram. 1996, “Quality Enhances Reliability,” IEEE Spectrum,vol.33, no. 2, pp. 34-41.

Hirofumi Akagi. 1996, “New Trends in Active Filters for Power Conditioning,” IEEE Trans. Ind. Applicat., vol.32, no. 6, pp. 1312-1322.

Dusan Graovac,Vladimir A. Katic,and Alfred Rufer. 2007, “Power Quality Problems Compensation With Universal Power Quality Conditioning System,” IEEE Trans. Power Del., vol.22, no. 2, pp. 968-976.

V.R.Kota, S.Vinnakoti. 2015, “SRF-based control of unified power quality conditioner for power quality enhancement,” IEEE Conf., Electrical, Electronics, Signals, Communication and Optimization (EESCO), pp. 1-6.

A.Jeraldine Vijji, T.Aruldoss Albert Victoire. 2014, “Enhanced PLL based SRF control method for UPQC with fault protection under unbalanced load conditions,” Elsevier, Int.J. Electrical Power and Energy Systems, vol.58, pp. 319-328.

Metin Kesler and Engin Ozdemir. 2011, “Synchronous-Reference-Frame-Based Control Method for UPQC Under Unbalanced and Distorted Load Conditions,” IEEE Trans. Ind. Electronics, vol. 58, no. 9, pp. 3967-3975.

Vinod Khadkikar and Ambrish Chandra. 2011, “UPQC-S: A Novel Concept of Simultaneous Volatge Sag/Swell and Load Reactive Power Compensations Utilizing Series Inverter of UPQC,” IEEE Trans. Power Electronics, vol. 26, no. 9, pp. 2415-2425.

Dragos Ovidiu Kisck and Mariana Kisck. 2007, “Single-Phase Unified Power Quality Conditioner With Optimum Voltage Angle Injection for Minimum VA requirement,” IEEE Conf., Power Electronics Specialists Conference (PESC), pp. 574-579.

Tejas Zaveri, B.R. Bhalja and Naimish Zaveri. 2012, “Load compensation using DSTATCOM in three-phase, three-wire distribution system under various source voltage and delta connected load conditions,” Elsevier, Int.J. Electrical Power and Energy Systems, vol.41, pp. 34-43.

Naimish Zaveri and Ajitsinh Chudasama. 2012, “Control strategies for harmonic mitigation and power factor correction using shunt active filter under various source voltage conditions,” Elsevier, Int.J. Electrical Power and Energy Systems, vol.42, pp. 661-671.

Abbas Ketabi, Mohammad Farshadnia, Majid Malekpour and Rene Feuillet. 2012, “A new control strategy for active power line conditioner (APLC) using adaptive notch filter,” Elsevier, Int.J. Electrical Power and Energy Systems, vol.47, pp. 31-40.

Vinod Khadkikar. 2012, “Enhancing Electric Power Quality Using UPQC: A Comprehensive Overview,” IEEE Trans. Power Electronics, vol. 27, no. 5, pp. 2484-2497.

S.B. Karanki, N.Geddada, M.K. Mishra and B.K. Kumar. 2013, “A Modified Three-phase Four Wire UPQC Topology with Reduced DC-link Voltage Rating,” IEEE Trans. Ind. Electronics, vol. 60, no. 9, pp. 3555-3566.

Hamid Reza Mohammadi, Ali Yazdian Varjani and Hossein Mokhtari. 2009, “Multiconverter Unified Power-Quality Conditioning System: MC-UPQC,” IEEE Trans. Power Delivery, vol. 24, no. 3, pp. 1679-1686.

Mekri Fatiha, Machmoum Mohamed Farshadnia, and Ait-Ahmed Nadia. 2011, “New hysteresis control band of an unified power quality conditioner,” Elsevier, Int.J. Electric Power Systems Research, vol.81, pp. 1743-1753.

Electrical Engineering (1)