A Doubly Grounded Boost Seven Level PV Inverter Topology with Model Predictive Controller

Abstract

Leakage currents reduction and elimination process is important task during the development of photovoltaic (PV) inverters and their associated control and modulation schemes. Compared to existing solutions, doubly grounded (DG) PV inverters represent vital solution for total cancellation of existing common mode voltages and hence their resulting leakage current components. This paper presents a new DG PV inverter topology with boosting capability of PV voltages, outputting seven level output voltage, having continuous current from PV side, and possessing reduced component count and elements. Moreover, a model predictive controller (MPC) is proposed for the proposed topology for controlling multiple objectives without the need for cascaded linear control loops, and with achieving fast tracking and response. The simulation results are provided in this paper with performance comparisons with existing DG PV inverter topologies in literature. The results also prove superior output and control characteristics of the proposed topology with reduced control complexity and reduced component counts.