This paper addresses a power sharing method of electronically interfaced distributed generation (DG) units in the context of a multiple-DG microgrid system where there is no synchronous generator. The emphasis is primarily on electronically interfaced DG (EI-DG) units like DFIG connected wind generator, PV system and battery storage. The power sharing is mainly based on locally measured signals without communications. The inverter connected to the battery energy storage system (BESS) changes the frequency of the network with the change in load demand. The real power of each DG unit is controlled based on a frequency-droop characteristic and a complimentary frequency restoration strategy. A systematic approach to develop a small-signal dynamic model of a multiple-DG microgrid, including a real power management method, is also presented. The model is also used to investigate sensitivity of the design to the changes in parameters and operating point and to optimize performance of the microgrid system.