PV Module-Level CHB Inverter with Integrated Battery Energy Storage System

Chiara Sirico, Remus Teodorescu, Dezso Séra, Marino Coppola, Pierluigi Guerriero, Diego Iannuzzi and Adolfo Dannier
Additional contact information
Chiara Sirico: Department of Electrical Engineering and Information Technologies, University of Napoli—Federico II, Via Claudio 21, 80125 Napoli, Italy
Remus Teodorescu: Department of Energy Technology, Aalborg University, Pontoppidanstraede 111, 9220 Aalborg, Denmark
Dezso Séra: Department of Energy Technology, Aalborg University, Pontoppidanstraede 111, 9220 Aalborg, Denmark
Marino Coppola: Department of Electrical Engineering and Information Technologies, University of Napoli—Federico II, Via Claudio 21, 80125 Napoli, Italy
Pierluigi Guerriero: Department of Electrical Engineering and Information Technologies, University of Napoli—Federico II, Via Claudio 21, 80125 Napoli, Italy
Diego Iannuzzi: Department of Electrical Engineering and Information Technologies, University of Napoli—Federico II, Via Claudio 21, 80125 Napoli, Italy
Adolfo Dannier: Department of Electrical Engineering and Information Technologies, University of Napoli—Federico II, Via Claudio 21, 80125 Napoli, Italy

Energies, 2019, vol. 12, issue 23, 1-20

Abstract: In this paper, a photovoltaic (PV) module-level Cascaded H-Bridge (CHB) inverter with an integrated Battery Energy Storage System (BESS) is proposed. The advantages and drawbacks of the CHB circuit architecture in distributed PV generation systems are highlighted. The main benefits are related to the higher granularity of the PV power control, which mitigates mismatch effects, thus increasing the power harvesting. Nevertheless, heavy unbalanced configurations due to the intermittent nature of PV sources need to be properly addressed. In order to smooth the PV fluctuations, a Battery Energy Storage System is used to provide both an energy buffer and coordination of power supply and demand to obtain a flat profile of the output power. In particular, by exploiting the inherent modularity of the conversion circuit, a distributed storage system is also implemented by splitting the battery into smaller units each of which represents the backup module of a single power cell of the PV CHB. The proposed design and control strategy allows overcoming the operating limits of PV CHB inverter. Simulation results, carried out on a single-phase nineteen-level PV CHB inverter, evidence the effectiveness of the proposed design and control approach to minimize the adverse impact of deep mismatch conditions, thus enabling continuous power output by compensating PV power fluctuations.

Keywords: photovoltaic power system; CHB inverter; distributed Maximum Power Point Tracking; battery energy storage system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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