Performance Evaluation of UPQC under Nonlinear Unbalanced Load Conditions Using Synchronous Reference Frame Based Control

Original Contribution


Today, maintaining Power Quality (PQ) is very important in the growing competent world. With new equipments and devices, new challenges are also being put before power system operators. Unified Power Quality Conditioner (UPQC) is proposed to mitigate many power quality problems and to improve the performance of the power system. In this paper, an UPQC with Fuzzy Logic controller for capacitor voltage balancing is proposed in Synchronous Reference Frame (SRF) based control with Modified Phased Locked Loop (MPLL). The proposed controller with SRF-MPLL based control is tested under non-linear and unbalanced load conditions. The system is developed in Matlab/Simulink and its performance is analyzed under various conditions like non-linear, unbalanced load and polluted supply voltage including voltage sag/swells. Active and reactive power flow in the system, power factor and %THD of voltages and currents before and after compensation are also analyzed in this work. Results prove the applicability of the proposed scheme for power quality improvement. It is observed that the fuzzy controller gives better performance than PI controller with faster capacitor voltage balancing and also improves the dynamic performance of the system.


Active Power Filter Fuzzy Logic Controller  Low Pass Butterworth Filter  SRF-MPLL Unified Power Quality Conditioner 


  1. 1.
    S. Orts-grau, N. Muñoz-galeano, J.C. Alfonso-gil, F.J. Gimeno-sales, S. Seguí-chilet, Discussion on useless active and reactive powers contained in the IEEE standard 1459. IEEE Trans. Power Deliv. 26(2), 640–649 (2011)CrossRefGoogle Scholar
  2. 2.
    A.Q. Ansari, B. Singh, M. Hasan, Algorithm for power angle control to improve power quality in distribution system using unified power quality conditioner. IET Gener. Transm. Distrib. 9(12), 1439–1447 (2015)CrossRefGoogle Scholar
  3. 3.
    V. Khadkikar, A. Chandra, A.O. Barry, T.D. Nguyen, Power quality enhancement utilising single-phase unified power quality conditioner: digital signal processor-based experimental validation. IET Power Electron. 4(3), 323 (2011)CrossRefGoogle Scholar
  4. 4.
    L.B.G. Campanhol, S.A. Oliveira, A. Goedtel, Application of shunt active power filter for harmonic reduction and reactive power compensation in three- phase four-wire systems. IET Power Electron. 7(11), 2825–2836 (2014)CrossRefGoogle Scholar
  5. 5.
    P. Salmerón, S.P. Litrán, Improvement of the electric power quality using series active and shunt passive filters. IEEE Trans. Power Deliv. 25(2), 1058–1067 (2010)CrossRefGoogle Scholar
  6. 6.
    M.S. Hamad, M.I. Masoud, S. Member, B.W. Williams, Medium-voltage 12-pulse converter : output voltage harmonic compensation using a series APF. IEEE Trans. Ind. Electron. 61(1), 43–52 (2014)CrossRefGoogle Scholar
  7. 7.
    O.S. Senturk, A.M. Hava, Performance enhancement of the single-phase series active filter by employing the load voltage waveform reconstruction and line current. IEEE Trans. Power Electron. 26(8), 2210–2220 (2011)CrossRefGoogle Scholar
  8. 8.
    F. Briz, S. Member, P. García, M.W. Degner, S. Member, D. Díaz-reigosa, J.M. Guerrero, Dynamic behavior of current controllers for selective harmonic compensation in three-phase active power filters. IEEE Trans. Ind. Appl. 49(3), 1411–1420 (2013)CrossRefGoogle Scholar
  9. 9.
    M. Angulo, D.A. Ruiz-caballero, J. Lago, S. Member, M.L. Heldwein, S.A. Mussa, Active power filter control strategy with implicit closed-loop current control and resonant controller. IEEE Trans. Ind. Electron. 60(7), 2721–2730 (2013)CrossRefGoogle Scholar
  10. 10.
    M. Popescu, A. Bitoleanu, V. Suru, A DSP-based implementation of the pq theory in active power filtering under nonideal voltage conditions. IEEE Trans. Ind. Inform. 9(2), 880–889 (2013)CrossRefGoogle Scholar
  11. 11.
    S. Golestan, M. Monfared, F.D. Freijedo, Design-oriented study of advanced synchronous reference frame phase-locked loops. IEEE Trans. Power Electron. 28(2), 765–778 (2013)CrossRefGoogle Scholar
  12. 12.
    M. Kesler, E. Ozdemir, Synchronous-reference-frame-based control method for UPQC under unbalanced and distorted load conditions. IEEE Trans. Ind. Electron. 58(9), 3967–3975 (2011)CrossRefGoogle Scholar
  13. 13.
    V.R. Kota, S. Vinnakoti, SRF-based Control of unified power quality conditioner for power quality enhancement, in IEEE International Conference on Electrical, Electronics, Signals, Communication and Optimization (EESCO), pp. 1–6 (2015)Google Scholar
  14. 14.
    Indian Standard_ Guide For Improvement of Power Factor in Consumers’ Installations: Part I - Low And Medium Supply Voltages. Bureau of Indian Standards, New Delhi.

Copyright information

© The Institution of Engineers (India) 2017

Authors and Affiliations

  1. 1.Department of Electrical and Electronics EngineeringJawaharlal Nehru Technological UniversityKakinadaIndia

Personalised recommendations