A non-iterative approach for AC state estimation using line flow based model

作者:Safdarian Amir; Fotuhi Firuzabad Mahmud*; Aminifar Farrokh
来源:INTERNATIONAL JOURNAL OF ELECTRICAL POWER %26 ENERGY SYSTEMS, 2012, 43(1): 1413-1420.
DOI:10.1016/j.ijepes.2012.06.057

摘要

One of the underlying requirements in the present energy management systems (EMSs) is to have a complete understanding of the system status. This feature is realized via state estimation (SE) engine. This paper presents a new and efficient SE approach which leads to a desirable outcome using a non-iterative calculation. The proposed model is based on a new AC power flow formulation designated as the line flow based (LFB) model. The objective function is to minimize the weighted least square of measurement residuals. The developed method adopts the line flows and square of voltage magnitudes as the problem state variables and incorporates both active and reactive power quantities. The transmission system losses are considered and linearized using the efficient piecewise linearization approach. Numerical analyses are conducted through two case studies. For the sake of comparison and validation, the conventional SE in both Gauss-Newton AC and DC versions are accommodated. Simulation results reveal that the proposed method outperforms the conventional AC-SE from the execution time viewpoint while keeping the accuracy of the results. A variety of sensitivity analyses are performed to demonstrate the effectiveness of the method in different conditions.

  • 出版日期2012-12