Operation and Control of a Back to Back Modular Multilevel Converter System for Grid Forming Application with Advanced Grid Support Functionalities

Roy Chowdhury, Vikram; Singh, Akanksha; Mather, Barry

doi:10.1109/ECCE53617.2023.10362324

Operation and Control of a Back to Back Modular Multilevel Converter System for Grid Forming Application with Advanced Grid Support Functionalities

Conference · Fri Dec 29 04:00:00 EST 2023

DOI:https://doi.org/10.1109/ECCE53617.2023.10362324· OSTI ID:2294064

Roy Chowdhury, Vikram; Singh, Akanksha;

The main focus of this paper is to investigate the possibility of using modular multilevel converter based back-to-back system for grid forming applications. A decentralized hierarchical control architecture with a modified local controller based on nonlinear techniques for grid forming application have been investigated. Grid functionalities based on IEEE 1547-2018 for grid forming converters have been utilized. The local controllers ensure distortion free balanced sinusoidal output voltage on the grid forming side with unbalanced or nonlinear loading condition. The grid following side ensures unity power factor currents under unbalanced grid voltage condition. The dc bus voltage control ensures oscillation free voltage under balanced conditions and control of the average voltage under unbalanced condition. Efficacy of the overall system is verified by modeling the system in MATLAB/Simulink and PLECS domain and the most important case studies are presented.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 2294064

Report Number(s):: NREL/CP-5D00-86921; MainId:87696; UUID:83cfa9ce-9e1d-4788-8622-35ad4d3e0ad9; MainAdminId:71781

Country of Publication:: United States

Language:: English

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