Photovoltaic power discarding is usually adopted by the operation staff of distribution network to alleviate the risk of voltage limit violation caused by the integration of high-penetration of photovoltaic

but this method may injure the interests of the PV owners. This paper proposes a voltage control method for distribution network based on PV power discarding rate optimization. The built PV power discarding rate optimization model

which takes the targets of comprehensive voltage deviation minimization and PV economic loss minimization

and considers the constraints of node voltage limit and photovoltaic power limit

is solved by the improved PSO algorithm with nonlinear inertia weight and asynchronous changing learning factor. The influence of the object function weights on the optimization results is analyzed.The correctness and effectiveness of the proposed method are verified by simulation examples.