To address the difficulty in finding feasible or optimal solutions to the optimal reactive power dispatch problem in active distribution networks using traditional optimization algorithms, this paper proposes a multi-objective optimization method for reactive power dispatch to improve solution accuracy and reduce power losses. With the power balance equations as the equality constraints and the transmission capacities of buses and feeders' capacities as the inequality constraints, a reactive power dispatch model is established, which aims to minimize active power losses, total voltage deviation, and total reactive power investment. A dynamic mutualism pelican optimization algorithm is proposed. This algorithm introduces a mutualistic phase from the symbiotic organisms search algorithm to facilitate communication between pelicans, balancing the exploration and exploitation phases of the pelican optimization algorithm. The dynamic weighting technique is employed to enhance the algorithm's exploration and convergence capabilities. Using the IEEE 69-node system as a case study, the proposed dynamic mutualism pelican optimization algorithm is compared with three other algorithms. The results show that the proposed algorithm achieves a well-distributed and broad Pareto front, contributing to improved power system stability. The research conclusion provides an effective optimization tool and decision-making reference for the efficient, stable and economical operation of active distribution networks.
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