Decentralized Carrier Interleaving in Cascaded Multilevel DC-AC Converters: Preprint
- University of Washington
- University of Colorado
- 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 Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; 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
- Resource Relation:
- Conference: Presented at the 2019 20th Workshop on Control and Modeling for Power Electronics (IEEE COMPEL), 17-20 June 2019, Toronto, Canada
- Country of Publication:
- United States
- Language:
- English
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