Large-Scale Grid Connected Quasi-Z-Source Inverter-Based PV Power Plant
Laís de Oliveira-Assís, Emanuel P. P. Soares-Ramos, Raúl Sarrias‐Mena, Pablo García–Triviño, Luis M. Fernández–Ramírez
Abstract
The application of quasi-Z source inverters (qZSI) for renewable energy sources has been presented as an attractive solution. This kind of inverters perform power conversion in a single stage with buck/boost capability and improved reliability compared to the conventional voltage source inverter. This paper focuses on the application of qZSI to a large-scale grid-connected photovoltaic (PV) system. The active and reactive powers are controlled using a version of the space vector modulation technique adapted to qZSI that allows a high modulation index. Furthermore, the sizing of the impedance components and the filter are described considering commercial values. Simulations are performed under a voltage sag and load variation on the grid, in order to verify the right design and performance of system and control methods. The results confirm the effectiveness of the proposed model and the control techniques applied to the large-scale grid-connected qZSI-based PV power plant.