Transformer Parameters and Transmission Line Temperatures Estimation in Three-phase Power Networks
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Abstract
This paper presents a method for temperature-dependent three-phase state estimation where not only bus voltage phasors but also tap ratio, leakage admittance parameters of transformers, line conductor temperature, and weather environment variables are considered as the state variables. The three-phase tap-changing transformer model and the weather-based transmission line model are integrated into the proposed state estimation, which is then formulated as a nonlinear optimization problem based on the weighted least squares objective function. The proposed method is demonstrated on the IEEE 30-bus and 118-bus systems modified as three-phase test systems. Simulation results indicate that the proposed formulation outperforms the conventional state estimations, which do not consider transformer parameters and line temperature, in terms of estimation accuracy and bad data detection performance.
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