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This is to certify that your paper entitled «Principles of operation and control of HVDC systems and their converters and review of the advantages and disadvantages of their use» was indexed with 13 pages, in the CIVILICA citation database, code COI:RSETCONF02_016, after evaluation and approval of the referees of the "2nd International Conference on Advanced Research in Science, Engineering and Technology held in Tehran 2020.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.