Design and simulation of fuzzy controller for a grid connected stand alone PV system

This paper presents the efficient voltage regulation of stand-alone photovoltaic cell for ac voltage application using fuzzy logic controller. The system containing solar PV cell, DC-DC boost converter and inverter coupled to the load system. In this work a 18 V photovoltaic cell is designed. A DC-DC boost converter is used for boosting of DC voltage obtained from photovoltaic cell. The advantage of using the proposed dc-dc converters are only one sensor is required, high power density, more efficient with reduced complexity of control. The inverter used to convert DC-AC for application purposes with closed loop controller. A typical fuzzy controller with 54 V is designed for DC-DC and 24 V is designed for DC-AC converter for good transient and steady state performances. The above system is analyzed with variation in temperature of PV cell and variation in the load parameters for the feasibility of the designed controller.. It is found that the controller developed provides fast responses and good performance. The simulations are highlighting the feasibility and validity of the developed control scheme. Hence this work gives the information of PV cell stand-alone model for effective power flow.