Decentralized Interleaving of Parallel-Connected Buck Converters
- University of Minnesota
- University of California, Berkeley
- University of Washington
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
We present a decentralized control strategy that yields switch interleaving for parallel-connected dc-dc buck converters. Compared to state-of-the-art methods that are distributed at best, the proposed architecture requires no communication, and hence, presents a variety of advantages with regard to reliability, modularity, and cost. The method is based on the digital implementation of the dynamics of a Lienard-type oscillator circuit as the controller for the converters. Each controller only requires the locally measured output current to synthesize the pulsewidth modulation (PWM) carrier waveform. The intrinsic electrical coupling between converters drives the nonlinear-oscillator-based controllers to converge to an interleaved state with uniform phase spacing across PWM carriers, independent of the number of converters, the load, and initial conditions. We provide analytical guarantees for existence and stability of the interleaved state as well as extensive hardware results for a system of five 120 W 48 V-to-12 V dc-dc buck converters that demonstrate convergence to the interleaved state in the face of a variety of large-signal disturbances.
- 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; National Science Foundation (NSF)
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1514842
- Report Number(s):
- NREL/JA-5D00-73923
- Journal Information:
- IEEE Transactions on Power Electronics, Vol. 34, Issue 5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Decentralized Interleaving of Paralleled Dc-Dc Buck Converters: Preprint
Decentralized Carrier Interleaving in Cascaded Multilevel DC-AC Converters