A Three-Phase Grid Tied Spv System with Adaptive Dc Link Voltage Gor Cpi Voltage Variations

Abstract

This proposed model manages a three-phase two stage grid tied SPV (solar photo voltaic) framework. The main stage is the boost converter, which fills the need of MPPT (maximum power point tracking) and sustaining the removed sunlight based validity to the DC connection of the PV inverter, while the second stage is a two-level VSC (voltage source converter) serving as PV inverter which bolsters control from a support converter into the matrix. The model likewise utilizes a adaptive DC link voltage which is made adaptive by modifying reference DC interface voltage as per CPI (common point on intersection) voltage. This adaptive DC link voltage control helps in the reduction of switching power losses. A sustained forward term for solar contribution is utilized to improve the dynamic response and the system is tested considering realistic grid voltage variations for under voltage and over voltage. The performance improvement is verified experimentally. The proposed system is advantageous for not only frequent and sustained under voltage (as in the cases of far radial ends of Indian grid) but also for normal voltages at CPI. The THD (total harmonics distortion) of grid current has been found well under the limit of an IEEE-519 standard.