In:
International Journal of Emerging Electric Power Systems, Walter de Gruyter GmbH, Vol. 22, No. 3 ( 2021-06-09), p. 353-367
Kurzfassung:
Modular multilevel converter for high voltage DC system has great potential as the key role in global energy interconnection . Adaptive reclosing or restarting after suffering from short-circuit faults is a critical segment to realize safe and stable operation. An adaptive restart scheme for the half-bridge sub-module transmission system is proposed, which is based on the active current injection of the auxiliary fault discriminate module. Combined with the engineering experience, the transient characteristics of the line current during the fault restart stage are analyzed. The ratio of the current peaks at both ends of the fault point is used as the criterion. Moreover, the restart current suppression strategy is introduced into the adaptive restart scheme. It provides a decision-making basis for discriminate the property of the fault and improves the success rate of fault restart. The simulation results show that after the external auxiliary module is introduced into the adaptive restart stage, the restart current does not exceed the rated value. Finally, The permanent fault and the transient fault can be successfully distinguished, providing a reliable guarantee for the subsequent action decision of the protection devices.
Materialart:
Online-Ressource
ISSN:
1553-779X
,
2194-5756
DOI:
10.1515/ijeeps-2020-0213
Sprache:
Englisch
Verlag:
Walter de Gruyter GmbH
Publikationsdatum:
2021
ZDB Id:
2207265-2
