GRID INTEGRATION OF PV-STATCOM USING FIVE LEVEL MULTILEVEL INVERTER

Abstract

Due to increase in non-linear/linear Loads exponentially, power quality has been a major concern nowadays. PQ issues and solutions for problems such as injection of harmonics by non-linear loads, voltage regulation, power factor correction etc. are current topics of research. So, harmonic mitigation using a five- level shunt multilevel inverter is the focus of this Thesis. In this work, PV-STATCOM is designed and simulated; its working is checked in two modes. In mode-1, both active and reactive power are supplied to grid, which is performed during day time only. In mode-2, only reactive power is supplied to the grid, and this mode works during night time. Therefore, the proposed PV-STATCOM can be utilized to its full potential throughout the day. Incremental conductance algorithm is utilized to extract maximum power. SRF control technique and PV feed forward term are combined to generate reference currents. Phase shift (PS)-PWM technique is implemented to generate the pulses. The whole complete system is simulated in both the modes under various load conditions. Some hardware results for the developed 5 level prototype are also illustrated.