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Abstract: This paper presents the design and development of a MW-level Microgrid project at Mae Sariang District Mae Hon Son province in northern of Thailand. The Microgrid project coverage area get power supply by a 110 km 22kV distribution line which also pass the forest area. Thus the power supply is not stable, and the power quality is not good, the weak power system has limited the local society development. To improve the power system in the mentioned area, the Microgrid project has decided to build which include four local resources: 1.2MW hydro-power plant, 4MWp solar PV, 5MW diesel generator and 3MW/1.5MWh battery energy storage system (BESS).Moreover, Power flow study, short circuit study, dynamic study and protection system design based on various combinations of RE systems are calculated using DIgSILENT PowerFactory software in achieving the most optimal design. The obtained solution shows that a hybrid combination of solar/ hydro/battery/diesel is cost effective, sustainable, social-economically and environmentally [1]. Additionally, the result shows that the Microgrid system could significantly increase the power system stability and reliability in the Microgrid coverage area. Moreover, after lost power supply from the main grid, by automatically black start function, the Microgrid system can supply power locally to the customer and can reduce the outage time from at least 20 minutes to within 1 minute.

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