A Unidirectional Single-Phase LLC Based High Frequency Link Inverter

Pal, A and Anand, VAG and Kuchibhatla, BS and Basu, K (2022) A Unidirectional Single-Phase LLC Based High Frequency Link Inverter. In: 2022 IEEE Energy Conversion Congress and Exposition (ECCE), 9 - 13 October 2022, Detroit, MI, USA.

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Abstract

This paper presents a resonant LLC based isolated single-phase DC-AC converter for grid connected photovoltaic systems. The converter employs a LLC DC-rectified AC stage followed by a line frequency unfolder. A constant switching frequency based modulation strategy is used to generate sinusoidal output voltage. The gain of the converter is independent of the load current in the operating region. To control active power flow, a small variation in gain is needed which results in small variation in operating frequency. This ensures optimal design of the magnetic components. A closed form expression of the converter voltage gain is derived. Additionally, load independent ZVS of the input H-bridge is ensured. A 2 kW prototype is designed and key simulation and experimental results are presented to verify the converter operation. © 2022 IEEE.

Item Type:	Conference Paper
Publication:	2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Bridge circuits; Electric inverters; Electric load flow; Gain measurement; Phase control; Power electronics; Timing circuits, DC-AC converter; High-frequency link inverter; Isolated DC-AC converter; LLC; Resonant converters; Single phasis; Small variations; Unfolder circuit; Voltage gain; Zero- Voltage Switching, Zero voltage switching
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	25 Jan 2023 12:21
Last Modified:	25 Jan 2023 12:21
URI:	https://eprints.iisc.ac.in/id/eprint/79518

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