Control for Disturbance Immune Operation of Synchronous Reluctance Diesel Generator Solar Photovoltaic System With Functional Enhancements

Maintaining voltage and current quality in islanded systems is challenging due to high impedance of connected ACsource. Fluctuating local loads draw distorted currents at point of common coupling (PCC), causing harmonic reflections and severe voltage quality issues. These abnormalities, including voltage sag/swell, harmonics, phase angle jumps, and frequency fluctuations, lead to degradation in overall system power quality, resulting in additional losses, poor power factor, and wear and tear of rotating machines functioning as AC generators. To address these power quality challenges, this work introduces an improved control approach integrated into solar inverter control. Hence, this work develops a multilayered mixed generalized integrator with a type-IV enhanced phase-locked loop (MMGI-EPLL-IV) control for a battery-less remote solar photovoltaic system (SPVS) connected to a synchronous reluctance diesel generator (SRDG). MMGI-EPLL-IV control selectively mitigates dominant odd harmonics and DC offsets, originating from sensor anomalies during voltage and current signal sensing. Type-IV EPLL control ensures immunity to phase angle and frequency fluctuations, eliminating negative sequence components and second harmonic ripple in estimated frequency. This prevents distortion of reference currents and internal control signals critical for system operation. Control effectiveness is validated by simulation and hardware results, including comparison with other similar existing control algorithms.