A Single-Stage Soft-Switched LVDC to Three-Phase MVAC Converter for MV Grid Integration of Utility-Scale Solar PV

Mazumder, S and Pal, A and Basu, K (2023) A Single-Stage Soft-Switched LVDC to Three-Phase MVAC Converter for MV Grid Integration of Utility-Scale Solar PV. In: ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics, 22-25 May 2023, Jeju Island, Korea, Republic of, pp. 1504-1508.

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Abstract

This paper presents a single-stage high-frequency link multi-level three-phase DC-AC converter for medium voltage grid integration of utility-scale solar park. On the DC side, three half-bridge legs are used. The converter employs three high-frequency transformers with multi-winding secondaries to provide galvanic isolation between the DC and AC sides. The output of each secondary winding is fed to an active rectifier followed by a full-bridge-based unfolder circuit to generate the line frequency AC. The rectifier-unfolder stages are then connected in cascade to build the medium voltage AC before connecting to the MV utility grid through line filters. The modulation strategy ensures zero-voltage switching of the DC side half-bridge legs throughout the line cycle. For DC-AC power flow, the secondary active rectifiers are soft-switched, and the unfolder circuits are line frequency switched, thus incurring negligible switching loss. The converter avoids using a bulky interstage DC- link filter capacitor. The operation of the converter is verified in MATLAB simulation, and critical simulation results are given in the paper. © 2023 The Korean Institute of Power Electronics.

Item Type:	Conference Paper
Publication:	ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	DC transformers; DC-DC converters; Electric inverters; Electric load flow; Electric rectifiers; High frequency transformers; Integration; MATLAB; Power electronics; Rectifying circuits; Transformer windings; Winding, DC side; DC-AC converter; Grid integration; High frequency HF; Medium voltage grid; Medium voltage grid integration; Single stage; Single stage high frequency link; Soft-switched; Utility scale PV, Zero voltage switching
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	24 Nov 2023 10:06
Last Modified:	24 Nov 2023 10:06
URI:	https://eprints.iisc.ac.in/id/eprint/83223

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