Abstract
As the core apparatus in dc distribution grid, the reliability of de transformer (DCT) directly affects the safe and stable operation of the entire dc grid. Firstly, the structure and characteristics of dual active bridge (DAB) based dc transformer are analyzed. Then, the hierarchical reliability model of dc transformer is established by using reliability block diagram (RBD). Furthermore, based on k-out-of-n redundancy model and Markov process theory, considering module redundant number, redundancy mode and component repair rate, a detailed and comprehensive reliability evaluation model of de transformer is proposed. Finally, based on the proposed reliability model of dc transformer, the influence of different redundancy designs and the component repair rate on the reliability of dc transformers are investigated through an example. The research results can provide a theoretical basis for redundancy design, redundancy mode selection and maintenance strategy of dc transformer, and contribute to the reliability of the whole dc grid.
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