Downsampled Iterative Learning Controller for Flyback CCM Inverter
SCIE
SCOPUS
- Title
- Downsampled Iterative Learning Controller for Flyback CCM Inverter
- Authors
- Kim, Hyosin; Lee, Jin S.; Kim, Minsung
- Date Issued
- 2018-01
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Abstract
- We propose a downsampled iterative learning controller (ILC) for a flyback inverter operating in continuous conduction mode (CCM). The flyback CCM inverter features step-up/-down ability, small number of circuit components, and high conversion efficiency, so it is well suited to the distributed renewable energy systems. But the conventional proportional-integral (PI) controller for the flyback CCM inverter shows poor steady-state response because the inverter itself suffers from time-varying grid-voltage disturbances and its transfer function has a right-half plane zero. The ILC itself achieves acceptable steady-state response of the flyback CCM inverter but can excite large overshoot in the iteration domain; this overshoot may destroy the solid state devices in the power circuit. To overcome this problem, we use a downsampled ILC technique that guarantees monotonic convergence of tracking error. The proposed ILC is computationally simple and easy to implement. Numerical simulations and experimental tests validate the proposed control approach.
- Keywords
- CONTROL STRATEGY; MICROINVERTER; CONVERTERS; EFFICIENCY; FEEDBACK; SYSTEMS; DESIGN
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50447
- DOI
- 10.1109/TIE.2017.2723858
- ISSN
- 0278-0046
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 65, no. 1, page. 510 - 520, 2018-01
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