Abstract
This paper proposes a novel power flow algorithm for islanded hybrid AC/DC microgrids. The algorithm is based on a recursive (non-iterative) method called the holomorphic embedding load flow method. The convergence properties of this method are more favorable than other iterative-based techniques such as Newton Raphson. The proposed power flow algorithm accounts for the special characteristics of hybrid microgrids by developing new holomorphically embedded versions for the DG droop characteristics on both the AC and DC microgrid as well as the interlinking AC/DC converter droop characteristics. The proposed approach is tested on two systems and in the presence of multiple interlinking systems. For each case, the results from the proposed algorithm are compared to detailed time-domain simulations performed using PSCAD/EMTDC to validate the accuracy of the proposed algorithm.
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