针对工业园区供电容量不满足用电负荷需求的情形，通过研究微电网系统用电策略，提出一种微电网双层优化模型。优化模型外层建立光伏-储能系统经济效益模型，以投资回收期、内部收益率作为经济效益的评价指标；内层以微电网、负荷、储能系统的运行状态等作为约束条件，同步考虑分布式光伏、储能系统与负荷间的配合，以供电可靠性作为评价指标，设置储能系统充放电运行策略。选取西北地区某工业园区作为应用场景，对优化模型求解，得到微电网系统最优容量配置。同时，对比分析改进优化方案和满足持续供电的储能容量配置方案，发现所提储能容量配置可实现最优经济效益，结合实际验证了该模型的有效性和可行性。

Through researching the power consumption strategy of microgrid, a bi-layer optimization model for microgrid is proposed in response to the situation that the power supply capacity of industrial parks cannot meet the demand for electricity loads. In the outer layer of the optimization model, an economic benefit model of photovoltaic-energy storage system is established, and the model uses payback period and internal rate of return as evaluation indicators of economic benefits. In the inner layer, the operating states of the microgrid, load, and energy storage system are taken as constraint conditions, and the cooperation between distributed photovoltaic, energy storage system and load is considered synchronously, and the model uses power supply reliability as an evaluation index to set up charging and discharging operation strategies of battery storage system. This paper selects an industrial park in the northwest region as the application scenario, and solves the optimization model to determine the optimal capacity configuration of the microgrid system. At the same time, by comparing and analyzing between the improved optimization scheme and the energy storage capacity configuration scheme that meets continuous power supply, it is found that the proposed energy storage capacity configuration can achieve optimal economic benefits, and its effectiveness and feasibility of the model are verified in practice.