The mixed power flow analysis method decreases the computational complexity and\nachieves a high level of simulation accuracy. The mixed approach combines the ac with the dc\npower flow models, depending on the area of interest. The accurate ac model is used in the study\narea of interest to obtain high simulation accuracy, while the approximate dc model is used in the\nremainder of the system to reduce the required computations. In the original mixed approach,\nthe errors originating from the use of the dc model may propagate to the area of interest where\naccurate simulation outcomes are required; thus, the simulation accuracy might not be satisfactory.\nThis paper presents a new method of enhancing the simulation accuracy of the mixed power flow\nanalysis using available information. In the proposed approach, a modified dc model is used instead\nof the traditional one and is constructed from an initial base-case ac solution. The new dc model\ncompensates for the errors originating from the neglect of the real power losses and the assumption of\na flat voltage magnitude in the conventional dc model. Thus, the proposed method can improve the\nsimulation accuracy in the area of interest. The superior computational benefits can also be preserved\nby maintaining linear characteristics of the dc model. Case studies with the IEEE 118-bus system are\nprovided to validate the enhanced accuracy of the proposed method.
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