Abstract
A dynamic fault reconfiguration method is proposed for dual-transformer series-connected active bridge converter with interconnected dc bus and integrated energy storage devices applied in shipboard bipolar DC system. The proposed converter can achieve both short-circuit fault-clearing at the source port and the load ports, thus effectively improving its reliability under complicated conditions. If short-circuit occurs on one of the output terminals connected with bipolar dc bus, the proposed fault reconfiguration method will enable the faulty terminal to be isolated to maintain the constant power transmission between storage devices and healthy terminal under monopolar mode. While if short-circuit occurs on input terminal connected with storage devices, the proposed fault reconfiguration method will ensure the supported power feasibly exchanges between two terminals connected the bipolar dc bus under the source-port fault mode so as to maintain the constant output power of certain terminals. Based on all of the operation modes, power transmission model and zero voltage switch (ZVS) operation boundaries of all switches are analysed for circuit parameters design. Besides, the control strategies under bipolar mode, monopolar mode and source-port fault mode are analysed respectfully according to the dynamic characteristics. Finally, performance of the proposed fault reconfiguration method has been tested in Matlab/PLECS environment, in verification of the converter reliability and flexibility.
Published Version
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