PSO Optimized Decentralized Secondary Control for Frequency and Voltage Restoration in Islanded AC Microgrid

This paper proposes a decentralized secondary control scheme suitable for islanded microgrid consist of multiple VF controlled inverters connected in parallel. The controller is based on proportional-integral control to maintain frequency and voltage under different load switching conditions. Moreover improved system performance and reliability are accomplished by managing proper power sharing among the participating inverters. Particle swam optimization is adapted to find best suitable gain parameters of the proportional-integral controller. Multiple simulation results of the islanded microgrid using MATLAB are discussed in detail to establish the above mentioned two main objectives of the paper i.e. maintaining frequency, voltage and balance load sharing among inverters.