With the development of distribution generation and microgrid

there will be a variety of microgrids in the future distribution network and the investors show a trend of diversification

which will bring a huge challenge for planning and design of distribution network. The paper discusses the structure of multilevel microgrids in distributed network. The user

investors represented by energy service companies

and energy companies are chosen as participants and the interest relationships among different investors are analyzed. The economic models based on different investors are established considering investment costs of distribution generation

electricity costs

subsidy

environmental benefit

and reliability benefit

etc. The optimal sizing model of multilevel microgrids in distribution network based on the game theory is proposed combining with game theory analysis method. From the economy points of view taking photovoltaic-battery microgrid as an example

the optimal sizing scheme of different investors under non-cooperative game scenario is discussed and analyzed

which provides a reference for design and construction of microgrid in the future distribution network. This work is supported by National Natural Science Foundation of China (No. 51507094

No. 51177093).