Quick Identification of Converter Valve Misbehavior Using Fuzzy Logic
Evacuation of bulk power from remote energy sources is now being carried out using FACTS and HVDC links, employing thyristorized converters. The converter valves are many times subjected to abnormal conditions that force them to misbehave. Commutation failure and fire through are the most common misbehaviors. Fuzzy logic appears to be most suitable for the implementation of the natural language definitions of these misbehaviors. This paper presents a fuzzy-logic-based valve misbehavior identification scheme that uses only valve currents along with their derivatives and gate pulses. The identifier response is almost instantaneous. The information supplied by the identifier can be logged for preparing a cumulative failure index, which can be used for performance evaluation of the valves and for planning preventive maintenance. A simulation study using PSCAD/EMTDC confirms the success of the proposed identifier.
Keywords: commutation failure; fire through; fuzzy logic; misbehavior identification
Document Type: Research Article
Affiliations: Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India
Publication date: 01 April 2006
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