Abstract: This paper proposes an optimization model based on the redundant reactive power output capability of PV inverters to address reactive power optimization issues in distribution networks with distributed PV integration. The goal is to effectively utilize the redundant capacity of PV inverters, reduce network losses, and enhance economic efficiency and stability. A reactive power optimization model is formulated to minimize network losses, and an improved particle swarm optimization algorithm (LNLPSO) incorporating Levy flight and nonlinear inertia weight decrement strategy is proposed. The approach is validated using an actual distribution line from the Shengli Oilfield Gudong Oil Production Plant, demonstrating significant reduction in system network losses and good engineering applicability.