Optimal sizing and control strategy of islanded microgrid using PSO technique

This paper proposes an optimal sizing and control strategy for islanded microgrid, consisting of renewable energy sources such as wind turbine generators (WT) and solar photovoltaic generators (PV), diesel generators (DE) and battery storage system (BS). The problem is formulated to minimize the annualized system cost (ASC) based on a control strategy with two modes. In mode 1, BS is the main power source and DE is backup power, but in mode 2, the master unit is DE and BS assists DE to improve reliability and economic operation benefit. Combination with the control strategy, particle swarm optimization (PSO) is used for a minimized optimization objective of the annualized system cost including initial cost, maintenance and operation (M&O) cost, replacement cost, fuel cost and pollutant emission cost. A case study of an islanded microgrid in Dong´ao Island is introduced to verify the proposed method.