A Simple Variable THD Load Emulation Technique for Performance Evaluation of Power Supply Equipment


Vani Vijay
C. Viswanatha
P. Giridhar Kini


Using load emulation, the performance of source side converters can be easily evaluated and improved without the need for actual load. Due to the increase in use of power electronic converters and SMPS based systems, the harmonic levels in load side has increased considerably. Hence emulation of variable THD load is very important in analysing the performance of source side converters and ensure the performance efficiency and power quality under such loads. Here a novel method of obtaining variable load using PWM control explained. The PWM is controlled in a rainbow sinusoidal fashion to obtain clipped waveform across a resistor so that harmonics is introduced in the Load. The power factor can also be varied in the system by paralleling it with leading and lagging converter circuits. The working principle, modelling and simulation are presented along with the results. Proposed technique provides accurate modulation of load THD and effect of harmonics loads on sources converter are also analysed using this.


How to Cite
Vijay, V., Viswanatha, C., & Giridhar Kini, P. (2016). A Simple Variable THD Load Emulation Technique for Performance Evaluation of Power Supply Equipment. Power Research - A Journal of CPRI, 12(2), 245–250. Retrieved from https://cprijournal.in/index.php/pr/article/view/207


  1. M Kesler, E Ozdemir, M C Kisacikoglu and L M Tolbert, Power Converter-Based Three-Phase Nonlinear Load Emulator for a Hardware Test bed System, IEEE Transactions on Power Electronics, Vol. 29, No.11, pp. 5806-5812, November 2014.
  2. H Y Kanaan, M Caron and K Al-Haddad, Design and Implementation of a Two-Stage Grid-Connected High Efficiency Power Load Emulator, IEEE Transactions on Power Electronics, Vol. 29, No. 8, pp. 39974006, August 2014.
  3. S Primavera, G Rella, F Maddaleno, K Smedley and A Abramovitz, One-cycle controlled three-phase electronic load, IET Power Electronics, Vol. 5, No. 6, pp. 827832, July 2012.
  4. Y S Rao and M C Chandorkar, Real-Time Electrical Load Emulator Using Optimal Feedback Control Technique, IEEE Transactions on Industrial Electronics, Vol. 57, No. 4, pp.1217-1225, April 2010.
  5. International Electro technical Commission, Standard IEC 61683-1-1, ed.1, 1999.
  6. N Mohan, T M Undeland and W P Robbins, Power Electronics converters, Applications and Design, John Wiley and Sons, 3rd Edition, 2002.
  7. H Muhammed Rashid, Power Electronics: Circuits, Devices and Applications, Pearson Education India, 2003.
  8. V F Pires and J F A Silva, "Teaching nonlinear modeling, simulation, and control of electronic power converters using MATLAB/SIMULINK," IEEE Transactions on Education, Vol. 45, No. 3, pp. 253-261, Aug 2002.
  9. N Mohan, W P Robbins, T M Undeland, R Nilssen and O Mo, Simulation of power electronic and motion control systems-an overview, Proceedings of the IEEE, Vol. 82, No. 8, pp. 1287-1302, Aug 1994.

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