Decentralized Carrier Interleaving in Cascaded Multilevel DC-AC Converters: Preprint

Conference · Wed Sep 11 04:00:00 EDT 2019

DOI:https://doi.org/10.1109/COMPEL.2019.8769699· OSTI ID:1562440

Dutta, Soham ^[1]; Malik, Rahul ^[1]; Majmunovic, Branko ^[2]; Mukherjee, Satyaki ^[2]; Seo, Gabsu ^[3]; Maksimovic, Dragan ^[2]; Johnson, Brian ^[1]

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1. University of Washington
2. University of Colorado
3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Cascaded dc-ac converters with interleaved carriers are commonly used in applications where elevated voltages and low-distortion multilevel waveforms are needed. Example applications include modular multilevel converters and solid-state transformers. In such systems, carrier interleaving is generally achieved via communication among the stacked converters or a centralized controller. Due to the large number of converters in such a system, existing approaches entail significant wiring complexity and communication may limit resilience to failures. In this paper, we introduce a control strategy which achieves communication-free carrier interleaving among series-connected converters. The proposed controller is embedded within each converter control loop and only requires measurements available at each set of converter terminals. We formulate a dynamic system model and show that the system converges to the interleaved condition irrespective of the number of converters in the stack. After outlining a practical method for digital implementation, experiments are shown on a hardware-in-the-loop setup.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1562440
• Report Number(s): NREL/CP-5D00-74846
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
cascaded H-bridges
communication-free interleaving
decentralized control
phase-shifted PWM
switch interleaving