Abstract
The methods currently used for transformer tap estimation are not robust against measurement errors, while the well-documented Least Absolute Value (LAV) State Estimator (SE) is not robust against transformer tap errors. This paper addresses these shortcomings by introducing the so-called Sparse Extended Least Absolute Value (SELAV) SE. By strategically modifying the formulation of LAV SE, the “sparse” nature of l 1 optimization is exploited for the tap estimation problem. The transformer tap positions can be reliably estimated, while the simultaneously produced state estimates (bus voltage angles and magnitudes) remain robust against tap errors. Case studies done using IEEE 57-bus test system are provided to illustrate the effectiveness of the proposed approach.
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