A branch-current-based state estimation for distribution systems non-measurement loads

A branch-current-based robust estimation method, which rejects bad data, is proposed for correcting pseudo measurements of 10 kV distribution systems. The exponential function of absolute residual vector is adopted in the algorithm, so that it can restrain bad influences from polluted measurements. The results of 33-bus IEEE test system show that not only the method is computationally more efficient than the conventional node-voltage-based state estimation (SE) methods but also the algorithm can efficiently correct pseudo measurements and make the accuracy of pseudo measurements reach or approach that of real-time measurements.