Multi-Functional UPS for Commercial Use


P. Lakshmana Rao
J. Sreedevi
G. N. Chethan


This paper proposes a line-interactive static UPS system with a simple control strategy for the operation of three-leg IGBT based AC/DC converter. Min-Max algorithm based PWM technique is used as switching logic for AC/DC converter. The developed control strategy addresses the applications like reactive power compensation of load, unbalanced currents compensation, active power compensation during peak load time on the grid and Seamless power transfer operation from grid-connected mode to islanding mode. LCL filter is designed to meet the THD limits specified in IEEE Std 519-2014.


How to Cite
Rao, P. L., Sreedevi, J., & Chethan, G. N. (2022). Multi-Functional UPS for Commercial Use. Power Research - A Journal of CPRI, 45–52.


  1. Krishnan R, Srinivasan S. Topologies for uninterruptible power supplies. Proceedings of IEEE International Symposium on Industrial Electronics; 1993. p. 122–7.
  2. Yeh C, Manjrekar M. A reconfigurable uninterruptible power supply system for multiple power quality applications. IEEE Transactions on Power Electronics. 2007;
  3. :1361–72.
  4. Bekiarov SB, Emadi A. Uninterruptible power supplies: Classification, operation, dynamics, and control. APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition. 2002; 1:597–604.
  5. Aamir M, Kalwar K, Mekhilef S. Review: Uninterruptible Power Supply (UPS) system. Renewable and Sustainable Energy Reviews. 2016; 58:1395–410.
  6. Chung S. A phase tracking system for three phase utility interface inverters. IEEE Transactions on Power Electronics. 2000; 15(3):431–8.
  7. Rastogi M, Bhat AH. Reactive power compensation using static synchronous compensator (STATCOM) with conventional control connected with 33kV grid. 2015 2nd International Conference on Recent Advances in Engineering and Computational Sciences (RAECS); 2015. p. 1–5. PMid:26117194
  8. Schonardie MF, Martins DC. Three-phase grid-connected photovoltaic system with active and reactive power control using dq0 transformation. 2008 IEEE Power Electronics Specialists Conference; 2008. p. 1202–7.
  9. Dheepanchakkravarthy A, Muthuvel P, Selvan MP, Moorthi S, Babu BC. Predictive current control of FL-shunt active filter for dynamic and heterogeneous load compensation. Electrical Engineering. 2021.
  10. Tirumala R, Mohan N, Henze C. Seamless transfer of gridconnected PWM inverters between utility-interactive and stand-alone modes. Proceedings of IEEE Applied Power Electronics Conference and Exposition; 2002. p. 1081–6.
  11. Reznik A, Simões MG, Al-Durra A, Muyeen SM. LCL filter design and performance analysis for grid-interconnected systems. IEEE Transactions on Industry Applications. 2014; 50(2):1225–32.
  12. Khan AM, Iqbal A. Comparative study between existing and proposed pwm techniques for three phase voltage source inverter. IEEE India International Conference on Power Electronics (IEEE IICPE-2010); 2011.
  13. Parvez M, Elias MFM, Rahim NA. Performance analysis of PR current controller for single-phase inverters. 4th IET Clean Energy and Technology Conference (CEAT 2016); 2016. p. 1–8.
  14. Akbarali MS, Subramanium SK, Natarajan K. Real and reactive power control of SEIG systems for supplying isolated DC loads. Journal of The Institution of Engineers (India): Series B. 2018 Dec; 99(6):587–95.
  15. Available from: