Advanced Fuzzy Logic Control of AC–DC Interconnecting Converters for Optimized Performance in Isolated Hybrid Microgrids

Solar and wind-based hybrid microgrids have high intermittency, which leads to a voltage variation, harmonic distortion and slow transient response in power conversion sections. To overcome such challenges, this paper comes up with a superior Fuzzy Logic Control (FLC) mechanism of both AC-DC interconnecting converters used in isolated microgrids. The controller actively controls the DC-link voltage, by means of nonlinear rule-based inference, without having to rely on fixed-gain tuning, as in PI controllers. Experimental performance and evaluation indicate significant changes, whereby voltage variation decreased by 6.3% to 1.8%, settling time had been halved by 0.84 s to 0.32 s and Total Harmonic Distortion (THD) was also alleviated by 4.2% to 2.1%. These findings confirm that the FLC-based converter is more effective in improving waveform purity, faster transient damping and constant bidirectional flow of power in changing renewable profiles. The scheme proposed is robust in control and realistic in the suitability of the next generation microgrids based on high levels of renewable sources.