Design And Implementation Of A Dual-Input Llc Converter For Pv-Battery Applications

Keywords

Battery energy storage; Dual-input LLC; LLC resonant converter; Microinverters

Abstract

This paper proposes a dual-input LLC resonant converter that interfaces with one PV panel and one battery energy storage system (BESS). The topology is a dual half-bridge LLC circuit with four active switches. This topology allows the two sources to share the same resonant tank for transferring energy to the load without the need for additional circuit components. A phase-shift pulse width modulation (PWM) control is employed to implement maximum power point tracking (MPPT) for PV panel and duty cycle is controlled to regulate battery current. The converter voltage gain is controlled by varying the operating frequency as in a typical LLC resonant converter. Zero-voltage-switching (ZVS) is realized in all switches over the entire range of source voltage and load conditions. In addition, voltage stress across switches does not exceed the input voltage. A simulation study was carried out to validate the operating principles of the proposed topology. The input voltage range of the PV source was selected to be 25 V to 50 V and the nominal input voltage of battery was 60 V with an output voltage regulated at ±200 V DC.

Publication Date

12-3-2018

Publication Title

2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

Number of Pages

5934-5940

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/ECCE.2018.8557910

Socpus ID

85060279998 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85060279998

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