Adaptive Control for Undisturbed Functioning and Smooth Mode Transition in Utility-Interactive Wind–Solar Based AC/DC Microgrid

The volatility of sustainable power generation sources combined with erratic grid behavior in economically developing countries brings forward intriguing challenges to the effective implementation of a wind–solar microgrid (MG). These challenges consist of preserving an undisturbed functioning of MG despite utility grid/renewable generation uncertainty, inculcating a smooth transition ability in MG amidst operation mode changes, and shielding the wind energy conversion system (WECS) from utility grid voltage disturbances. The last of the three becomes increasingly pertinent for doubly-fed induction generator (DFIG)–based WECSs due to their vulnerability against grid disturbances. This article addresses these challenges and proposes a new DFIG solar photovoltaic (SPV) array-based MG configuration. In this configuration, DFIG is integrated within the MG structure such that its functioning is not impacted directly by any grid disturbances. Meanwhile, an exponential hyperbolic cosine adaptive filter–based control that operates as per a devised functional strategy is also presented. A functional strategy is developed to ensure the undisturbed operation and smooth mode transitions in ac/dc MG. In addition, to tackle the detrimental effects of unbalance, harmonics, and reactive power demand of MG ac loads, power quality enhancement features are instilled within the control framework. To verify these functionalities, a laboratory-scale prototype of the grid-interactive DFIG-SPV based ac/dc MG is developed. Test results exhibit the satisfactory steady-state and dynamic performances of MG.