In this paper, a photovoltaic (PV) tied modified three-port active flyback converter (MTPACFC) operated three-phase micro-inverter is presented to provide enhanced voltage gain with fewer components. The proposed micro-inverter transfers the power generated on the 12 V PV power generation system to 400 V, AC grid. Generally, the DC-DC converter designed with an active clamp circuit provides improved power transfer capability to transfer the power from the PV array. The conventional active clamp flyback converters are designed to offer a limited boost factor for the input voltage. The recommended three-port altered flyback converter is intended to offer double boosting for the input voltage with extended performance. Besides, a synchronous reference frame theory with an artificial neural network based grid side controller is adapted to provide low total harmonic distortion at the point of common coupling. The outcomes of the simulated and test models are introduced to approve the boosting capacity and performance of the proposed MTPACFC.

This paper proposes a fuzzy logic based new control scheme for the Unified Power Quality Conditioner (UPQC) for minimizing the voltage sag and total harmonic distortion in the distribution system consequently to improve the power quality. UPQC is a recent power electronic module which guarantees better power quality mitigation as it has both series-active and shunt-active power filters (APFs). The fuzzy logic controller has recently attracted a great deal of attention and possesses conceptually the quality of the simplicity by tackling complex systems with vagueness and ambiguity. In this research, the fuzzy logic controller is utilized for the generation of reference signal controlling the UPQC. To enable this, a systematic approach for creating the fuzzy membership functions is carried out by using an ant colony optimization technique for optimal fuzzy logic control. An exhaustive simulation study using the MATLAB/Simulink is carried out to investigate and demonstrate the performance of the proposed fuzzy logic controller and the simulation results are compared with the PI controller in terms of its performance in improving the power quality by minimizing the voltage sag and total harmonic distortion.

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