Abstract: To address the issues of source-load mismatch, voltage fluctuations, and increased costs caused by high penetration of distributed generation in distribution networks, an optimal dispatch method coordinating distributed generation and energy storage is proposed. With the objective of minimizing the total operation cost, a dispatch model is established incorporating costs of power purchase, line loss, renewable curtailment, energy storage operation, and voltage deviation, and is solved using second-order cone relaxation. A 17-node case study validates that distributed generation can reduce power purchase and costs; energy storage can further optimize power purchase timing and improve renewable energy accommodation; and introducing voltage penalty can improve voltage quality with almost no increase in operation cost.