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This approach for a three-phase Distribution System State Estimator (DSSE) considers all the analog measurements including voltage and current measurements and active and reactive power measurements and historical load- information. The estimation of improved load information is based on an interior point optimization. It reduces the estimation problem to load groups which located in so called measurement areas. Grouping of loads with the same weighting pushes the state variables of the optimization to a minimum. The proposal is designed for radial as well as for networks with some meshes. The power mismatches at the boundary between neighboring areas are eliminated by equality constraints. This significantly reduces size of the estimation problem. Index Terms—power distribution systems, distribution system state estimation, load modeling, weighted least absolute value, equality constraints.

Real Time Distribution System State Estimation Based On Interior Point Method