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Two-Level State Estimation With Local Measurement Pre-Processing
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DOI：10.1109/TPWRS.2009.2016591.png)
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Abstract
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This paper presents a two-level state estimation methodology intended to integrate in a simple and efficient manner the results provided by local estimators, handling measurements at the substation level, within the framework of existing EMS. This leads to a paradigm in which raw measurements are locally pre-processed by a linear estimator, in such a way that only a manageable subset of measurements is handled at the second level, significantly reducing the communication bandwidth. Simulation results show that, even when the two steps are centrally carried out, the proposed approach is computationally more efficient than the conventional one, particularly with highly redundant measurement sets.
Keywords:
Hierarchical state estimation
measurement pre-processing
substation state estimation
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