Power Sharing Strategy for PV Microinverter with Embedded Hybrid Energy Storage System

Abstract

The use of microinverters in photovoltaic systems mitigates the losses produced by the discrepancy between modules. In addition, due to the intermittent nature of photovoltaic energy, the system must have an energy storage system. In the following paper, a hierarchical control strategy based on the feedback linearization control technique and a low-pass filter is proposed for the control of both the PV microinverter and the Hybrid Energy Storage System (HESS) composed of battery and super capacitor, which increase the energy density and power density of the system. In this way, a dynamic energy distribution is achieved, taking full advantage of the physicochemical characteristics of the HESS. Simulated results are presented to validate the suitability of the proposed control strategy.