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A Novel Approach for Three-Phase V/f...

14 pagesPublished: August 5, 2017


This paper proposes a new topology for ac-to-ac power conversion, which is a three-stage conversion. It comprises of a diode rectifier (ac-to-dc), a buck- boost converter (dc-to-dc) and anH-bridge inverter (dc-to-ac) working as an ac chopper. The topology works as V/f drive wherein the frequency is varied by the buck-boost converter and the voltage is varied by the inverter, which is used as a chopper. Thus, it provides variable output voltage and frequency for all three- phases, which can be used for V/f control of induction motor. As compared to the conventional two-stage conversion i.e. ac-dc-ac (ac-to-ac conversion with intermediate stiff dc-link), proposed topology has advantage of improved THD in output voltage, as the input to the inverter is not a stiffed dc but it is a pulsating dc, provided from output of buck-boost converter. Moreover the blocking voltage of each switch of inverter is not constant voltage but varies according to the pulsating input of inverter, thus the stress across switch, as well as machine winding will reduce as compared to two stage conversion system. The proposed scheme offers linear variation of output voltage from zero to rated, avoiding nonlinear overmodulation range used in conventional inverters. The simulation studies are carried out in Matlab/Simulink 2014 and various results are presented.

Keyphrases: buck-boost converter, DC-Link Voltage Modulation, Inverter as AC Chopper, Three-Phase V/f Drive

In: Ajitkumar Shukla, J. M. Patel, P. D. Solanki, K. B. Judal, R. K. Shukla, R. A. Thakkar, N. P. Gajjar, N. J. Kothari, Sukanta Saha, S. K. Joshi, Sanjay R. Joshi, Pranav Darji, Sanjay Dambhare, Bhupendra R. Parekh, P. M. George, Amit M. Trivedi, T. D. Pawar, Mehul B. Shah, Vinay J. Patel, Mehfuza S. Holia, Rashesh P. Mehta, Jagdish M. Rathod, Bhargav C. Goradiya and Dharita K. Patel (editors). ICRISET2017. International Conference on Research and Innovations in Science, Engineering and Technology. Selected Papers in Engineering, vol 1, pages 302--315

BibTeX entry
  author    = {Prof. Dr. P. N. Tekwani and Kinjal Macwan and Vidhi Patel},
  title     = {A Novel Approach for Three-Phase V/f...},
  booktitle = {ICRISET2017. International Conference on Research and Innovations in  Science, Engineering and Technology. Selected Papers in Engineering},
  editor    = {Ajitkumar Shukla and J. M. Patel and P. D. Solanki and K. B. Judal and R. K. Shukla and R. A. Thakkar and N. P. Gajjar and N. J. Kothari and Sukanta Saha and S. K. Joshi and Sanjay R. Joshi and Pranav Darji and Sanjay Dambhare and Bhupendra R. Parekh and P. M. George and Amit M. Trivedi and T. D. Pawar and Mehul B. Shah and Vinay J. Patel and Mehfuza S. Holia and Rashesh P. Mehta and Jagdish M. Rathod and Bhargav C. Goradiya and Dharita K. Patel},
  series    = {Kalpa Publications in Engineering},
  volume    = {1},
  pages     = {302--315},
  year      = {2017},
  publisher = {EasyChair},
  bibsource = {EasyChair,},
  issn      = {2515-1770},
  url       = {},
  doi       = {10.29007/xvx6}}
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