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Research on Line Switch Statuses Identification in Distribution Networks Using TTU Measurements

The intelligence level of distribution networks keeps improving in recent years. For example, in China, the distribution transformer supervisory terminal unit(TTU), which can intelligently monitor and manage the distribution transformer area, is being widely installed in distribution networks. These TTUs can provide real-time distribution transformer operation data. To increase the value of these data, this paper focuses on the line switch statuses identification technology in distribution networks using TTU measurement data. Firstly, based on the analysis of the TTU measurement data, an optimization equation of which the objective function is the residual error between measurements and estimations is formulated. Secondly, the nonlinear terms in the original optimization equation are eliminated, and it is converted into a mixed integer quadratic programming(MIQP) problem so that it can be solved using the standard method. Moreover, a voltage measurement correction algorithm using the solution of the objective function is proposed. Finally, case studies are conducted to verify the effectiveness of the proposed method.