Fuzzy Logic-Based Control Strategy for Minimizing DG Genset Runtime in Solar PV–Battery–DG AC Microgrids

Paper ID: EIJTEM_2025_12_4_199-209

Author's Name: Farheen Sulthana, Dr. K. Srinivas

Volume: 12

Issue: 4

Year: 2025

Page No: 199-209

Abstract:

Diesel generator (DG) Genset-based microgrids play a crucial role in supplying power to remote regions; however, their continuous operation often results in high fuel costs and increased environmental emissions. Although it is not feasible to completely eliminate DG usage, its operational time can be significantly reduced through an effective control mechanism. This study introduces an enhanced control approach for a hybrid AC microgrid comprising "Photovoltaic solar array, energy storage battery, and diesel-based generator set" aiming to lower the system’s reliance on the diesel generator. The proposed method ensures that the DG Genset operates only during critical conditions, thereby cutting down its runtime and improving transition stability between different operating modes. The control logic is built on a rule-based framework that evaluates SPV generation levels, battery charge status, and load requirements to determine whether DG support is necessary. Moreover, when the DG is in operation, it operates at full capacity while maintaining a unity power factor, optimizing fuel utilization. The system employs a Fuzzy Logic Controller alongside a cascaded second-order generalized integrator (C-SOGI)-based phase-locked loop (PLL) to achieve precise synchronization and improved power quality. Simulation results highlight the superior effectiveness and efficiency of the proposed control approach when compared to traditional techniques.

Keywords: Fuzzy Logic Controller (FLC), Diesel Genset, Battery Energy Storage System (BESS), Solar Photovoltaic (SPV), Microgrid Control, Cascaded SOGI-PLL, Power Quality, DG Runtime Reduction, Hybrid AC Microgrid, Renewable Energy Integration

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