Smooth Transition Multi-Mode Control With Logarithmic Hyperbolic Cosine Filter for Multisource Wind–Solar–Diesel Microgrid

This research presents a multisource microgrid equipped with DG-sets, focusing on its control strategy for seamless multimode transitions and essential multifunctional enhancements. System employs multiple doubly-fed induction generators (DFIGs) for wind power and solar photovoltaic (SPV) arrays. DFIGs operate independently of grid voltage irregularities, such as imbalances or distortions. Proposed decentralized microgrid control strategy ensures uninterrupted power supply to local loads and facilitates seamless transitions between different operating states, including various connection and disconnection modes involving DFIGs and DG-sets. A logarithmic hyperbolic cosine filter (LHCF) is integrated into control to maintain consistent power injection despite fluctuations generation or demand. During prolonged grid outages, control optimizes diesel consumption. Real-time results validate overall operation of microgrid and efficacy of LHCF control strategy. Research ensures complete seamless transition states across all possible operational modes, maintaining uninterrupted load power delivery during state changes, such as grid outages, DG set switchovers, and renewable energy fluctuations. By integrating emergency mode-only transition state logic, control strategy minimizes diesel fuel consumption, reducing operational costs and carbon emissions while ensuring fuel efficiency. LHCF improves system power quality, aligning with IEEE standards, and decouples utility abnormalities from AC sub-grid. Control for converters and system mode transition and independent operation is proven using real-time results.