Optimum economic dispatch of interconnected microgrid with energy storage system

Interconnected microgrid system enhance reliability and reduce spinning reserve due to higher redundancy. It is useful for areas where conventional power grid cannot be connected. This paper presents optimal economic dispatch strategy of distributed generation where two microgrids and a single energy storage system (ESS) are interconnected together. Genetic algorithm is used to minimize the operating cost of the proposed system and to find out the optimum value of the output power produced by distributed generator. The objective function comprises of fuel cost, operation and maintenance cost, as well as cost of emissions. One of the microgrids consists of diesel engine generator, microturbine generator, solar PV and another with fuel cell and wind turbine generator. The ESS is charged from the interconnected microgrids and can be used for load frequency regulation and spinning reserve of the system.