A Novel AWMOGI Control for Single Stage SPVA Based Hybrid Microgrid with Smooth Mode Transfer Capabilities

Remote power systems progressively incorporate solar photovoltaic arrays (SPVA). However, the negative impact of peak power loads and erratic SPVA power results in serious system instability. A hybrid SPVA and battery energy storage (BES) grid-integrated single-stage systems are proposed to provide clean and green energy throughout the day. The proposed system uses perturb and observe (P&O) maximum power point tracking (MPPT) to extract maximum power from SPVA. A bidirectional DC-DC converter (BDDC) is used along with MPPT to operate the battery in a buck or boost mode. Additionally, the system has an anti-windup mixed order generalized integrator (AWMOGI) that extracts positive sequence voltages at the point of common coupling (PCC) and is impervious to noise and harmonics disturbances during grid-connected mode (GCM). Proportional resonant (PR) controller is used during standalone mode (SAM), which has less oscillation and fast convergence. The proposed architecture is designed to supply the local nonlinear load with reliable power during transients, changes in solar irradiation, grid outages, and grid resynchronization. Total harmonic distortion (THD) is observed to be less than 5% of grid currents in GCM and load voltage in SAM.