Frontiers in Energy
>> 2023,
Volume 17,
Issue 1
doi:
10.1007/s11708-020-0711-2
RESEARCH ARTICLE
Fault-tolerant control of an open-winding brushless doubly-fed wind power generator system with dual three-level converter
. School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China.. Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, Warwick, UK.. School of Electrical Engineering, Shandong University, Jinan 250061, China
Accepted: 2020-12-10
Available online: 2023-02-15
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Abstract
To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fed generation system applied to large offshore wind farms, the control winding of a brushless doubly-fed reluctance generator is designed as an open-winding structure. Consequently, the two ends of the control winding are connected via dual three-phase converters for the emerging open-winding structure. Therefore, a novel fault-tolerant control strategy based on the direct power control scheme is brought to focus in this paper. Based on the direct power control (DPC) strategy, the post-fault voltage vector selection method is explained in detail according to the fault types of the dual converters. The fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance generator (BDFRG) system to operate normally in one, two, or three switches fault of the converter, simultaneously achieving power tracking control. The presented results verify the feasibility and validity of the scheme proposed.
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