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This paper proposes a new classification method based on Hidden Markov Models and wavelet transform to discriminate HVDC converter faults. In the proposed technique, probabilistic characteristics of signals discriminate fault signals without any deterministic index, so more flexible classification in different system conditions is achieved. Based on this method, high-speed protection decisions with small computational time could be performed in approximately 5\u2009ms for severe system faults, and in 12.5\u2009ms for faults that are restricted by protective control decision. PSCAD\/EMTDC software simulations demonstrate suitable performance of this scheme for different fault types and system conditions in the International Council for Large Electric Systems (CIGRE) HVDC benchmark. All simulation results validate the stability and robustness of proposed scheme in different conditions, such as noisy systems.<\/jats:p>","DOI":"10.1177\/0037549711413495","type":"journal-article","created":{"date-parts":[[2011,9,2]],"date-time":"2011-09-02T20:49:54Z","timestamp":1314996594000},"page":"668-679","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["A new converter fault discrimination method for a 12-pulse high-voltage direct current system based on wavelet transform and Hidden Markov Models"],"prefix":"10.1177","volume":"88","author":[{"given":"Mohamad","family":"Tahan","sequence":"first","affiliation":[{"name":"School of ECE, University of Tehran, Iran"}]},{"given":"Hassan","family":"Monsef","sequence":"additional","affiliation":[{"name":"School of ECE, University of Tehran, Iran"}]},{"given":"Shahrokh","family":"Farhangi","sequence":"additional","affiliation":[{"name":"School of ECE, University of Tehran, Iran"}]}],"member":"179","published-online":{"date-parts":[[2011,9,1]]},"reference":[{"key":"bibr1-0037549711413495","doi-asserted-by":"publisher","DOI":"10.1109\/59.141790"},{"key":"bibr2-0037549711413495","doi-asserted-by":"publisher","DOI":"10.1109\/59.651633"},{"key":"bibr3-0037549711413495","doi-asserted-by":"publisher","DOI":"10.1109\/DRPT.2000.855665"},{"key":"bibr4-0037549711413495","first-page":"158","author":"Shang L","year":"2001","journal-title":"Proceedings of IEEE PPT"},{"key":"bibr5-0037549711413495","doi-asserted-by":"publisher","DOI":"10.1109\/59.962411"},{"key":"bibr6-0037549711413495","first-page":"1","author":"Gang W","year":"2005","journal-title":"Proceedings of IEEE TDC"},{"key":"bibr7-0037549711413495","author":"Darvish HA","year":"2006","journal-title":"Proceedings of IEEE PES"},{"key":"bibr8-0037549711413495","first-page":"463","volume":"30","author":"Ying J","year":"2000","journal-title":"IEEE Trans"},{"key":"bibr9-0037549711413495","first-page":"378","volume":"21","author":"Faruque MO","year":"2006","journal-title":"Detailed modeling of CIGRE HVDC benchmark system using PSCAD\/EMTDC and PSB\/SIMULINK"},{"key":"bibr10-0037549711413495","doi-asserted-by":"publisher","DOI":"10.1049\/PBPO029E"},{"key":"bibr11-0037549711413495","doi-asserted-by":"publisher","DOI":"10.1016\/j.eswa.2006.04.007"},{"key":"bibr12-0037549711413495","first-page":"179","author":"Jazebi S","year":"2008","journal-title":"IEEE OPTIM"},{"key":"bibr13-0037549711413495","doi-asserted-by":"publisher","DOI":"10.1109\/5.18626"},{"key":"bibr14-0037549711413495","doi-asserted-by":"crossref","unstructured":"Jazebi S, Vahidi B, Hosseinian SH, Shafiee M, Naghizadeh RA. 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