1. Bidirectional DC-DC converters for distributed energy resources: Robust predictive control with structurally-adaptive extended state observers
- Author
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Oluleke O. Babayomi, Zhenbin Zhang, Zhen Li, and Ki-Bum Park
- Subjects
Model predictive control ,Model uncertainty ,Measurement noise suppression ,dc-dc boost converter ,Robust control ,Extended state observer ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Distributed energy resources (DER) are integrated into a microgrid through dc-dc power electronic converters. The bidirectional dc-dc converter regulates charging and discharging operations of ESS. Model predictive control (MPC), is a high-performance control technique for these converters, but it is limited in robustness to parameter mismatch, model uncertainties and sensor measurement noise. Therefore, in this paper, an improved hybrid cascade-parallel extended state observer (CP-ESO) is proposed, for model-free predictive control, to guarantee both robustness to parameter/model uncertainties and measurement noise suppression. A novel structurally-adaptive ESO scheme is also proposed to improve the disturbance rejection of CP-ESO during transient response. These results are supported by analysis and design guidelines for the selection of optimal sub-frequencies. Experimental results, for a bidirectional dc-dc boost converter, validate the effectiveness of the proposed methods against model uncertainties, external disturbances from variable input voltage and load, as well as measurement noise.
- Published
- 2024
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