This paper presents a elimination of voltage steady-state error and achieve high-accuracy current estimation without using current sensor. The elimination of voltage steady-state error and achieve high-accuracy current estimation purpose using comprehensive compensation strategy. This comprehensive compensation strategy algorithm cannot effectively eliminate the output voltage steady-state error, so fuzzy logic controller is implemented. A digital current-mode controller for dc-dc converters is introduced.The current control mode proposed current observer and PCC algorithm. It achieves the highest observation accuracy by compensating for all the known parasitic parameter. By employing the optimal current observer-based predictive current controller, a boost converter is implemented. The current-mode loop is sensorless, relying on constants and internal loop states. Fast current-mode control mechanism is implemented. This control scheme is that it facilitates the application of a low resolution PWM.

ABSTRACT:In normal MPPT controlling methods, all the PV panels are connected to single MPPT to produce maximum output. If any fault occurs in the PV Panel or less irradiance in some part of the panel (partially shaded PV system) also leads to reduction in power generation. In the proposed system the efficiency is increased for partially shaded PV system by using "distributed" MPPT (DMPPT) technique. In this method each panel is connected separately to separate MPPT. Each MPPT is connected to the Buck-Boost converter to compensate the voltage variation in the different PV panel. Finally all the MPPT's are connected in parallel which increases the power production and efficiency.