VSG Control Applied to Seven-Level PV Inverter for Partial Shading Impact Abatement

Abstract

This paper describes the use of a Cascaded H-Bridge Multilevel Inverter to deal with the problem of partial shading in a photovoltaic system connected to the grid. Combined with the topology, it proposes the use of a virtual synchronous generator for power sharing between photovoltaic arrays and to ensure the connection to the power grid even in extreme shading situations with no power buffer. The experimental results demonstrate the feasibility of the strategy adopted and the limitations to overcome.

Keywords

• partial shading
• cascaded multilevel inverter
• droop control
• active power transfer