The increasing penetration of various distributed and renewable energy resources at the consumption premises, along with the advanced metering, control and communication technologies, promotes a transition on the structure of traditional distribution systems towards cyber-physical multi-microgrids (MMGs). The networked MMG system is an interconnected cluster of distributed generators, energy storage as well as controllable loads in a distribution system. And its operation complexity can be decomposed to decrease the burdens of communication and control with a decentralized framework. Consequently, the multi-microgrid energy management system (MMGEMS) plays a significant role in improving energy efficiency, power quality and reliability of distribution systems, especially in enhancing system resiliency during contingencies. A comprehensive overview on typical functionalities and architectures of MMGEMS is illustrated. Then, the emerging communication technologies for information monitoring and interaction among MMG clusters are surveyed. Furthermore, various energy scheduling and control strategies of MMGs for interactive energy trading, multi-energy management, and resilient operations are thoroughly analyzed and investigated. Lastly, some challenges with great importance in the future research are presented.

With the growing concerns on the energy crisis and the strong support of policies, the development and construction of the multi-energy infrastructure are booming in the world. The post-evaluation for the multi-energy infrastructure investment projects can discover problems, giving advice for improvement, and guide the future project process management, which plays a significant role in achieving closed-loop and lean management. In this paper, a comprehensive overview on the post-evaluation indicators of overall multienergy infrastructure construction processes is illustrated. Then, the post-evaluation indicators on economic benefits are surveyed from the financial and national economic perspectives. Furthermore, the indicators to evaluate the impact on society and environment induced by the multi-energy infrastructure are thoroughly analyzed and investigated. Also, the post-evaluation indicators on the sustainability of the multi-energy infrastructure investment projects are summarized. Lastly, some challenges with great importance in the future research are presented. This review contributes to finding out the problems existing in the multi-energy infrastructure projects and analyzing the causes of the problems, which helps to guide the enterprise's future investment direction, decision-making, and realize an accurate investment.