This paper proposes differential evolutionary particle swarm optimization (DEEPSO) for load adjustment distribution state estimation (DSE) using correntropy. Practical equipment in distribution systems causes nonlinear characteristics in an objective function and evolutionary computation methods have been applied to DSE so far. This paper applies DEEPSO in order to improve estimation equality. Minimization of sum of square errors by the least squares method has a problem when outliers exit in measured values. Quality of estimated results is largely affected by the outliers using the least squares method, while correntropy has a possibility not to be affected by the outliers. The proposed method is applied to a typical distribution system. The results indicate that the proposed DEEPSO-based method can improve estimation results compared with conventional particle swarm optimization (PSO) and hybrid PSO-based method, and the correntropy-based proposed method can estimate distribution system conditions more accurately than the conventional least squares method.
K E Y W O R D Scorrentropy, differential evolutionary particle swarm optimization, distribution system, load adjustment distribution state estimation Electr Eng Jpn. 2018;205:11-21.