Improved Admittance Matrix Estimation on Power Networks Based on Hybrid Measurements

This paper proposes an improved admittance matrix estimation method on power networks based on hybrid measurements. The method only requires voltage magnitude measurements for the most buses, and PMU measurements
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only placed on very limited number of buses. The proposed approach first improves the existing admittance matrix estimation method via establishing a new model of the power networks under estimation, with system voltage phasors and the admittance matrix as the unknown states. Afterwards, the model is solved through the Newton's method to obtain the admittance matrix. Numerical experiments validates that accurate and reliable estimation of the admittance matrix can be achieved using the proposed method. The method also demonstrates robustness towards measurement errors.