Quasi-Z Source T-type Power Converter for PV Based Commercial and Industrial Nanogrids with Active Functions Strategy

In this Project proposes a comprehensive control strategy for Quasi-Z Source T-Type PV inverters inside a facility, which performs active and reactive power control, and harmonic and imbalance compensation at expenses of the spare inverter power capacity. Unlike other approaches, the one proposed here operates properly under distorted and unbalanced grid voltages. The electrical network structure inside a commercial and industrial facility is considered, analyzing the operation of the proposed strategy on three-phase PV inverters. The power topology used has voltage boosting ability, which eliminates the requirement for both an additional DC-DC converter and/or a step-up transformer commonly used in PV inverter systems. The proposed strategy performance is demonstrated on a 50 kW converter model under a disturbed grid environment and changing load conditions.

Keywords: commercial and industrial Nanogrids; grid-interactive PV inverters; reactive power compensation; harmonics and imbalance compensation; quasi-impedance-source T-type inverters.