中文摘要：

微电网被认为是提高分布式电源利用效率的有效方式,其在节能减排、可再生能源利用、提高供电可靠性、解决偏远地区和海岛供电问题等方面具有诸多的优势。微电网建设有助于打破传统大电网在价格、市场准入等方面的垄断,提高了区域内用电的可靠性与灵活性,同时降低了环境污染及对资源的压力,有利于改善社会福利。笔者使用竞合博弈模型,分析了微电网与大电网的竞合关系,探讨了两者的合作条件,并对两者合作带来社会福利改善的具体机制进行了探究。分析结果表明：外部性正反馈于相关企业合作的努力程度,从而增进社会福利;外部性与自有资产存在替代效应,从而增进社会福利。

英文摘要：

Micro-grid is considered to be an effective way to improve the efficiency of distributed power, which has many advantages in energy conservation, renewable energy use, and solving supply problems in remote areas and islands, etc. Implementation of micro-grid construction helps to break the monopoly of the traditional large power grids in terms of price and market access, and improve the reliability and flexibility of electricity in the region, while reducing environmental pollution and pressure on resources, which helps to improve social welfare. This article uses the competinggame model to analyze the competing relationship between the micro-grid and the large-grid, discusses the conditions for cooperation between them, and explores the specific mechanism of the social welfare brought by their cooperation. The results show that external positive feedback feeds back on the effort level of associated enterprises, thereby enhancing social welfare; while there is a substitution effect between the externality and self-processed assets, thus enhancing social welfare.