Robust load frequency control in a smart microgrid with PHEV-based V2G control

This paper focuses on a new design of frequency controller for robust load frequency control (LFC) in a smart isolated microgrid (MG) system with plug-in hybrid electric vehicles (PHEV)-based vehicle-to-grid (V2G) control and wind farms. The V2G control can compensate the unbalance of real power in system. The state-of-charge (SOC) of battery can be managed by using the SOC balance control method. The studied frequency controller structure is a proportional integral (PI) with a single input. The multiplicative uncertainty is used to model the system uncertainties. To improve both robust stability margin and performance, the PI control parameters are automatically designed by the particle swarm optimization (PSO) based on the specified-structure mixed H 2/H ∞ control method. Simulation results exhibit the superior robustness and performance of the proposed controller against the system parameters change.